Periodic Table

{{sources needed}}{{Chemistry}}{{See also|List of elements in the periodic table}}
{{cquote|There's antimony, arsenic, aluminum, selenium<br>
And hydrogen and oxygen and nitrogen and rhenium<br>
And nickel, neodymium, neptunium, germanium<br>
And iron, americium, ruthenium, uranium<br>
Europium, zirconium, lutetium, vanadium<br>
And lanthanum and osmium and astatine and radium<br>
And tantalum, technetium, titanium, tellurium<br>
And cadmium and calcium and chromium and curium...|||[[Tom Lehrer]], ''The Elements''}} 
'''The Periodic Table''' is a chart which organises [[chemistry|chemical]] [[element]]s into groups based on their various properties — ascending by [[atom|atomic]] number and grouped by things such as reactivity and valency. While it was first organised by these macroscopic properties, it actually forms a map of the atomic orbital structure indicating how [[quantum theory|quantum mechanical]] concepts relate to chemical properties. The most commonly accepted version of the Periodic Table was invented by [[Russian]] chemist Dmitri Mendeleyev in the second half of the 19th century, though others were part of a push towards order in the chemical world<ref>https://www.asbmb.org/asbmb-today/science/020721/a-brief-history-of-the-periodic-table</ref>.

==Origins==
Chemical behaviour is generally very messy, complicated, and irregular.<ref>More specifically:
*'''Inorganic Chemist:''' "Inorganic chemistry is messy, complicated and irregular and therefore interesting. Organic chemistry is boring and predictable." 
*'''Organic Chemist:''' "Organic chemistry is messy, complicated and irregular and therefore interesting. Inorganic chemistry is boring and predictable."</ref> Chemists, in contrast, enjoy making neat and tidy lists of things. By the 17th century, chemists had begun to use the concept of an "[[element]]" in its modern sense (i.e. a substance which cannot be broken down into a simpler substance using chemical means) — which was nice and tidy — but, distressingly, they had also begun to discover dozens of new elements besides those which had been known for centuries — this was distressingly untidy. A glimmer of hope was at hand, however: it was noticed that many of these newly discovered elements appeared to exhibit similar properties, seeming almost to belong to 'families'. Moreover, these similar properties often seemed to exhibit trends when the elements were placed in order of '''{{wplnologo|Atomic mass unit|atomic weight}}'''. Examples included "triads" such as chlorine, bromine, and iodine, and copper, silver, and [[gold]].

The race was on amongst chemists to draw up some kind of nice tidy list which would arrange the ever-increasing numbers of these pesky new elements in some kind of elegant way which brought order to the increasing chemical mess. The breakthrough was finally made by Mendeleev. His Table managed to set out the elements in rows and columns, in order (more or less) of atomic weight, so that those elements with similar properties fell into nice tidy vertical groups. Mendeleev made two particular innovations over previous pedants:

*in a couple of cases where listing the elements in order of atomic weight would have messed up his groups, he swapped elements around so that they fitted the pattern
*in further cases where listing the elements in any order wouldn't fit the pattern at all, he declared there must be a "missing element" and left a gap for it in the table.

However, Mendeleev couldn't, at the time, provide any physical explanation of why there should be missing elements, or why atomic weights occasionally needed swapping around. The trends were evident, but the knowledge of atomic structure and the identity of the missing elements was still far off, meaning that there was no verifiable proof that the periodic table was as Mendeleev hypothesised. Still, he stuck to his hypothesis, and the [[falsifiability|testable]] predictions of what properties these missing elements ought to have if and when they were discovered. Luckily for him, his predictions were correct!

Later, the discovery of atomic structure ([[proton]]s, [[neutron]]s, and [[electron]]s) provided a sound rationalising for Mendeleev's quirky ''[[ad hoc]]'' tweaks, and vindicated his periodic table. It was discovered that the shared properties of similar elements was due to these their having the same number of electrons in their outer shells. Thus, silicon has similar reactivities to [[carbon]], although their difference in physical size also affects these properties. These observed facts are combined in their arrangement in the modern Periodic Table of the Elements.

Elements in the table are sorted by the increasing number of protons in their nuclei, from 1 to 118. There is no necessary reason for the number of elements to end there, but heavier elements would have half-lives in minute fractions of a millisecond, so they'd be very difficult to detect. However, similarly to what Mendeleev did, it is possible to predict the properties of these hypothetical elements using both periodic trends and our current understanding of [[physics]]. The structure of the table is based on the electronic structure of the atom: in the "p" block for example, there are elements for which the outermost electron is in a "p" orbital.

==And here it is!==
{| border="0" cellpadding="0" cellspacing="1" style="background:#f7f7e9; text-align: center; {{{1|}}} border:1px solid #a9a9a9; display:block; max-width:1300px; margin: 0 auto;"
|- bgcolor=#e9e955
! scope="col" style="width: 2.8%;" | Group&nbsp;#
! scope="col" style="width: 5.4%;" | 1
! scope="col" style="width: 5.4%;" | 2
! scope="col" style="width: 5.4%;" | 3
! scope="col" style="width: 5.4%;" | 4
! scope="col" style="width: 5.4%;" | 5
! scope="col" style="width: 5.4%;" | 6
! scope="col" style="width: 5.4%;" | 7
! scope="col" style="width: 5.4%;" | 8
! scope="col" style="width: 5.4%;" | 9
! scope="col" style="width: 5.4%;" | 10
! scope="col" style="width: 5.4%;" | 11
! scope="col" style="width: 5.4%;" | 12
! scope="col" style="width: 5.4%;" | 13
! scope="col" style="width: 5.4%;" | 14
! scope="col" style="width: 5.4%;" | 15
! scope="col" style="width: 5.4%;" | 16
! scope="col" style="width: 5.4%;" | 17
! scope="col" style="width: 5.4%;" | 18
|-
! scope="col" | Period
| colspan="18" |
|-
! scope="row" | 1
| style="background: #a0ffa0;" | 1<br />'''[[Hydrogen|H]]'''<br /><small><small><small>Hydrogen<br/>
| colspan="16" |
| style="background: #c0ffff;" | 2<br />'''[[Helium|He]]'''<br /><small><small><small>Helium<br/>
|-
! scope="row" | 2
| style="background: #ff6666;" | 3<br />'''{{wplnologo|Lithium|Li}}'''<br /><small><small><small>Lithium<br/>
| style="background: #ffdead;" | 4<br />'''{{wplnologo|Beryllium|Be}}'''<br /><small><small><small>Beryllium<br/>
| colspan="10" |
| style="background: #cccc99;" | 5<br />'''{{wplnologo|Boron|B}}'''<br /><small><small><small>Boron<br/>
| style="background: #a0ffa0;" | 6<br />'''[[Carbon|C]]'''<br /><small><small><small>Carbon<br/>
| style="background: #a0ffa0;" | 7<br />'''{{wplnologo|Nitrogen| N}}'''<br /><small><small><small>Nitrogen<br/>
| style="background: #a0ffa0;" | 8<br />'''[[Oxygen|O]]'''<br /><small><small><small>Oxygen<br/>
| style="background: #ffff99;" | 9<br />'''[[Fluorine|F]]'''<br /><small><small><small>Fluorine<br/>
| style="background: #c0ffff;" | 10<br />'''{{wplnologo|Neon|Ne}}'''<br /><small><small><small>Neon<br/>
|-
! scope="row" | 3
| style="background: #ff6666;" | 11<br />'''{{wplnologo|Sodium|Na}}'''<br /><small><small><small>Sodium<br/>
| style="background: #ffdead;" | 12<br />'''{{wplnologo|Magnesium|Mg}}'''<br /><small><small><small>Magnesium<br/>
| colspan="10" |
| style="background: #cccccc;" | 13<br />'''[[Aluminum|Al]]'''<br /><small><small><small>Aluminum<br/>
| style="background: #cccc99;" | 14<br />'''{{wplnologo|Silicon|Si}}'''<br /><small><small><small>Silicon<br/>
| style="background: #a0ffa0;" | 15<br />'''{{wplnologo|Phosphorus|P}}'''<br /><small><small><small>Phosphorus<br/>
| style="background: #a0ffa0;" | 16<br />'''{{wplnologo|Sulfur|S}}'''<br /><small><small><small>Sulfur<br/>
| style="background: #ffff99;" | 17<br />'''{{wplnologo|Chlorine|Cl}}'''<br /><small><small><small>Chlorine<br/>
| style="background: #c0ffff;" | 18<br />'''{{wplnologo|Argon|Ar}}'''<br /><small><small><small>Argon<br/>
|-
! scope="row" | 4
| style="background: #ff6666;" | 19<br />'''{{wplnologo|Potassium|K}}'''<br /><small><small><small>Potassium<br/>
| style="background: #ffdead;" | 20<br />'''[[Calcium|Ca]]'''<br /><small><small><small>Calcium<br/>
| style="background: #ffc0c0;" | 21<br />'''{{wplnologo|Scandium|Sc}}'''<br /><small><small><small>Scandium<br/>
| style="background: #ffc0c0;" | 22<br />'''{{wplnologo|Titanium|Ti}}'''<br /><small><small><small>Titanium<br/>
| style="background: #ffc0c0;" | 23<br />'''{{wplnologo|Vanadium|V}}'''<br /><small><small><small>Vanadium<br/>
| style="background: #ffc0c0;" | 24<br />'''{{wplnologo|Chromium|Cr}}'''<br /><small><small><small>Chromium<br/>
| style="background: #ffc0c0;" | 25<br />'''{{wplnologo|Manganese|Mn}}'''<br /><small><small><small>Manganese<br/>
| style="background: #ffc0c0;" | 26<br />'''[[Iron|Fe]]'''<br /><small><small><small>Iron<br/>
| style="background: #ffc0c0;" | 27<br />'''{{wplnologo|Cobalt|Co}}'''<br /><small><small><small>Cobalt<br/>
| style="background: #ffc0c0;" | 28<br />'''{{wplnologo|Nickel|Ni}}'''<br /><small><small><small>Nickel<br/>
| style="background: #ffc0c0;" | 29<br />'''{{wplnologo|Copper|Cu}}'''<br /><small><small><small>Copper<br/>
| style="background: #ffc0c0;" | 30<br />'''{{wplnologo|Zinc|Zn}}'''<br /><small><small><small>Zinc<br/>
| style="background: #cccccc;" | 31<br />'''{{wplnologo|Gallium|Ga}}'''<br /><small><small><small>Gallium<br/>
| style="background: #cccc99;" | 32<br />'''{{wplnologo|Germanium|Ge}}'''<br /><small><small><small>Germanium<br/>
| style="background: #cccc99;" | 33<br />'''[[Arsenic|As]]'''<br /><small><small><small>Arsenic<br/>
| style="background: #a0ffa0;" | 34<br />'''{{wplnologo|Selenium|Se}}'''<br /><small><small><small>Selenium<br/>
| style="background: #ffff99;" | 35<br />'''{{wplnologo|Bromine|Br}}'''<br /><small><small><small>Bromine<br/>
| style="background: #c0ffff;" | 36<br />'''{{wplnologo|Krypton|Kr}}'''<br /><small><small><small>Krypton<br/>
|-
! scope="row" | 5
| style="background: #ff6666;" | 37<br />'''{{wplnologo|Rubidium|Rb}}'''<br /><small><small><small>Rubidium<br/>
| style="background: #ffdead;" | 38<br />'''{{wplnologo|Strontium|Sr}}'''<br /><small><small><small>Strontium<br/>
| style="background: #ffc0c0;" | 39<br />'''{{wplnologo|Yttrium|Y}}'''<br /><small><small><small>Yttrium<br/>
| style="background: #ffc0c0;" | 40<br />'''{{wplnologo|Zirconium|Zr}}'''<br /><small><small><small>Zirconium<br/>
| style="background: #ffc0c0;" | 41<br />'''{{wplnologo|Niobium|Nb}}'''<br /><small><small><small>Niobium<br/>
| style="background: #ffc0c0;" | 42<br />'''{{wplnologo|Molybdenum|Mo}}'''<br /><small><small><small>Molybdenum<br/>
| style="background: #ffc0c0;" | 43<br />'''{{wplnologo|Technetium|Tc}}'''<br /><small><small><small>Technetium<br/>
| style="background: #ffc0c0;" | 44<br />'''{{wplnologo|Ruthenium|Ru}}'''<br /><small><small><small>Ruthenium<br/>
| style="background: #ffc0c0;" | 45<br />'''{{wplnologo|Rhodium|Rh}}'''<br /><small><small><small>Rhodium<br/>
| style="background: #ffc0c0;" | 46<br />'''{{wplnologo|Palladium|Pd}}'''<br /><small><small><small>Palladium<br/>
| style="background: #ffc0c0;" | 47<br />'''{{wplnologo|Silver|Ag}}'''<br /><small><small><small>Silver<br/>
| style="background: #ffc0c0;" | 48<br />'''{{wplnologo|Cadmium|Cd}}'''<br /><small><small><small>Cadmium<br/>
| style="background: #cccccc;" | 49<br />'''{{wplnologo|Indium|In}}'''<br /><small><small><small>Indium<br/>
| style="background: #cccccc;" | 50<br />'''{{wplnologo|Tin|Sn}}'''<br /><small><small><small>Tin<br/>
| style="background: #cccc99;" | 51<br />'''{{wplnologo|Antimony| Sb}}'''<br /><small><small><small>Antimony<br/>
| style="background: #cccc99;" | 52<br />'''{{wplnologo|Tellurium| Te}}'''<br /><small><small><small>Tellurium<br/>
| style="background: #ffff99;" | 53<br />'''[[Iodine| I]]'''<br /><small><small><small>Iodine<br/>
| style="background: #c0ffff;" | 54<br />'''{{wplnologo|Xenon| Xe}}'''<br /><small><small><small>Xenon<br/>
|-
! scope="row" | 6
| style="background: #ff6666;" | 55<br />'''{{wplnologo|Caesium| Cs}}'''<br /><small><small><small>Caesium<br/>
| style="background: #ffdead;" | 56<br />'''{{wplnologo|Barium| Ba}}'''<br /><small><small><small>Barium<br/>
| style="background: #ffbfff;" | *
| style="background: #ffc0c0;" | 72<br />'''{{wplnologo|Hafnium| Hf}}'''<br /><small><small><small>Hafnium<br/>
| style="background: #ffc0c0;" | 73<br />'''{{wplnologo|Tantalum| Ta}}'''<br /><small><small><small>Tantalum<br/>
| style="background: #ffc0c0;" | 74<br />'''{{wplnologo|Tungsten| W}}'''<br /><small><small><small>Tungsten<br/>
| style="background: #ffc0c0;" | 75<br />'''{{wplnologo|Rhenium| Re}}'''<br /><small><small><small>Rhenium<br/>
| style="background: #ffc0c0;" | 76<br />'''{{wplnologo|Osmium| Os}}'''<br /><small><small><small>Osmium<br/>
| style="background: #ffc0c0;" | 77<br />'''{{wplnologo|Iridium| Ir}}'''<br /><small><small><small>Iridium<br/>
| style="background: #ffc0c0;" | 78<br />'''{{wplnologo|Platinum| Pt}}'''<br /><small><small><small>Platinum<br/>
| style="background: #ffc0c0;" | 79<br />'''[[Gold|Au]]'''<br /><small><small><small>Gold<br/>
| style="background: #ffc0c0;" | 80<br />'''[[Mercury|Hg]]'''<br /><small><small><small>Mercury<br/>
| style="background: #cccccc;" | 81<br />'''{{wplnologo|Thallium| Tl}}'''<br /><small><small><small>Thallium<br/>
| style="background: #cccccc;" | 82<br />'''[[Lead|Pb]]'''<br /><small><small><small>Lead<br/>
| style="background: #cccccc;" | 83<br />'''{{wplnologo|Bismuth| Bi}}'''<br /><small><small><small>Bismuth<br/>
| style="background: #cccc99;" | 84<br />'''{{wplnologo|Polonium| Po}}'''<br /><small><small><small>Polonium<br/>
| style="background: #ffff99;" | 85<br />'''{{wplnologo|Astatine| At}}'''<br /><small><small><small>Astatine<br/>
| style="background: #c0ffff;" | 86<br />'''{{wplnologo|Radon| Rn}}'''<br /><small><small><small>Radon<br/>
|-
! scope="row" | 7
| style="background: #ff6666;" | 87<br />'''{{wplnologo|Francium| Fr}}'''<br /><small><small><small>Francium<br/>
| style="background: #ffdead;" | 88<br />'''[[Radium|Ra]]'''<br /><small><small><small>Radium<br/>
| style="background: #ff99cc;" | **
| style="background: #ffc0c0;" | 104<br />'''{{wplnologo|Rutherfordium| Rf}}'''<br /><small><small><small>Rutherfordium<br/>
| style="background: #ffc0c0;" | 105<br />'''{{wplnologo|Dubnium| Db}}'''<br /><small><small><small>Dubnium<br/>
| style="background: #ffc0c0;" | 106<br />'''{{wplnologo|Seaborgium| Sg}}'''<br /><small><small><small>Seaborgium<br/>
| style="background: #ffc0c0;" | 107<br />'''{{wplnologo|Bohrium| Bh}}'''<br /><small><small><small>Bohrium<br/>
| style="background: #ffc0c0;" | 108<br />'''{{wplnologo|Hassium| Hs}}'''<br /><small><small><small>Hassium<br/>
| style="background: #e8e8e8;" | 109<br />'''{{wplnologo|Meitnerium| Mt}}'''<br /><small><small><small>Meitnerium<br/>
| style="background: #e8e8e8;" | 110<br />'''{{wplnologo|Darmstadtium| Ds}}'''<br /><small><small><small>Darmstadtium<br/>
| style="background: #e8e8e8;" | 111<br />'''{{wplnologo|Roentgenium| Rg}}'''<br /><small><small><small>Roentgenium<br/>
| style="background: #ffc0c0;" | 112<br />'''{{wplnologo|Copernicium| Cn}}'''<br /><small><small><small>Copernicium<br/>
| style="background: #e8e8e8;" | 113<br />'''{{wplnologo|Nihonium| Nh}}'''<br /><small><small><small>Nihonium<br/>
| style="background: #e8e8e8;" | 114<br />'''{{wplnologo|Flerovium| Fl}}'''<br /><small><small><small>Flerovium<br/>
| style="background: #e8e8e8;" | 115<br />'''[[Moscovium|Mc]]'''<br /><small><small><small>Moscovium<br/>
| style="background: #e8e8e8;" | 116<br />'''{{wplnologo|Livermorium| Lv}}'''<br /><small><small><small>Livermorium<br/>
| style="background: #e8e8e8;" | 117<br />'''{{wplnologo|Tennessine| Tn}}'''<br /><small><small><small>Tennessine<br/>
| style="background: #e8e8e8;" | 118<br />'''{{wplnologo|Oganesson| Og}}'''<br /><small><small><small>Oganesson<br/>
|-
| colspan="19" | <br />
|-
! scope="row" colspan="3" style="text-align: right; padding-right: 1em;" | *
| style="background: #ffbfff;" | 57<br />'''{{wplnologo|Lanthanum| La}}'''<br /><small><small><small>Lanthanum<br/>
| style="background: #ffbfff;" | 58<br />'''{{wplnologo|Cerium| Ce}}'''<br /><small><small><small>Cerium<br/>
| style="background: #ffbfff;" | 59<br />'''{{wplnologo|Praseodymium| Pr}}'''<br /><small><small><small>Praseodymium<br/>
| style="background: #ffbfff;" | 60<br />'''{{wplnologo|Neodymium| Nd}}'''<br /><small><small><small>Neodymium<br/>
| style="background: #ffbfff;" | 61<br />'''{{wplnologo|Promethium| Pm}}'''<br /><small><small><small>Promethium<br/>
| style="background: #ffbfff;" | 62<br />'''{{wplnologo|Samarium| Sm}}'''<br /><small><small><small>Samarium<br/>
| style="background: #ffbfff;" | 63<br />'''{{wplnologo|Europium| Eu}}'''<br /><small><small><small>Europium<br/>
| style="background: #ffbfff;" | 64<br />'''{{wplnologo|Gadolinium| Gd}}'''<br /><small><small><small>Gadolinium<br/>
| style="background: #ffbfff;" | 65<br />'''{{wplnologo|Terbium| Tb}}'''<br /><small><small><small>Terbium<br/>
| style="background: #ffbfff;" | 66<br />'''{{wplnologo|Dysprosium| Dy}}'''<br /><small><small><small>Dysprosium<br/>
| style="background: #ffbfff;" | 67<br />'''{{wplnologo|Holmium| Ho}}'''<br /><small><small><small>Holmium<br/>
| style="background: #ffbfff;" | 68<br />'''{{wplnologo|Erbium| Er}}'''<br /><small><small><small>Erbium<br/>
| style="background: #ffbfff;" | 69<br />'''{{wplnologo|Thulium| Tm}}'''<br /><small><small><small>Thulium<br/>
| style="background: #ffbfff;" | 70<br />'''{{wplnologo|Ytterbium| Yb}}'''<br /><small><small><small>Ytterbium<br/>
| style="background: #ffbfff;" | 71<br />'''{{wplnologo|Lutetium| Lu}}'''<br /><small><small><small>Lutetium<br/>
|
|-
! scope="row" colspan="3" style="text-align: right; padding-right: 1em;" | **
| style="background: #ff99cc;" | 89<br />'''{{wplnologo|Actinium| Ac}}'''<br /><small><small><small>Actinium<br/>
| style="background: #ff99cc;" | 90<br />'''{{wplnologo|Thorium| Th}}'''<br /><small><small><small>Thorium<br/>
| style="background: #ff99cc;" | 91<br />'''{{wplnologo|Protactinium| Pa}}'''<br /><small><small><small>Protactinium<br/>
| style="background: #ff99cc;" | 92<br />'''[[Uranium|U]]'''<br /><small><small><small>Uranium<br/>
| style="background: #ff99cc;" | 93<br />'''{{wplnologo|Neptunium| Np}}'''<br /><small><small><small>Neptunium<br/>
| style="background: #ff99cc;" | 94<br />'''{{wplnologo|Plutonium| Pu}}'''<br /><small><small><small>Plutonium<br/>
| style="background: #ff99cc;" | 95<br />'''{{wplnologo|Americium| Am}}'''<br /><small><small><small>Americium<br/>
| style="background: #ff99cc;" | 96<br />'''{{wplnologo|Curium| Cm}}'''<br /><small><small><small>Curium<br/>
| style="background: #ff99cc;" | 97<br />'''{{wplnologo|Berkelium| Bk}}'''<br /><small><small><small>Berkelium<br/>
| style="background: #ff99cc;" | 98<br />'''{{wplnologo|Californium| Cf}}'''<br /><small><small><small>Californium<br/>
| style="background: #ff99cc;" | 99<br />'''{{wplnologo|Einsteinium| Es}}'''<br /><small><small><small>Einsteinium<br/>
| style="background: #ff99cc;" | 100<br />'''{{wplnologo|Fermium| Fm}}'''<br /><small><small><small>Fermium<br/>
| style="background: #ff99cc;" | 101<br />'''{{wplnologo|Mendelevium| Md}}'''<br /><small><small><small>Mendelevium<br/>
| style="background: #ff99cc;" | 102<br />'''{{wplnologo|Nobelium| No}}'''<br /><small><small><small>Nobelium<br/>
| style="background: #ff99cc;" | 103<br />'''{{wplnologo|Lawrencium| Lr}}'''<br /><small><small><small>Lawrencium<br/>
|
|}
<br />
{| border="2" cellpadding="4" style="background:silver; border:1px solid gray; border-collapse:collapse; margin:auto; font-size:90%; text-align:center; {{{1|}}}" 
|-
| colspan=6 style="background: #f7f7e9;" | Metals
| rowspan=3 style="background: #cccc99;" | Metalloids 
| colspan=3 style="background: #f7f7e9;" | Nonmetals
| rowspan=3 style="background: #e8e8e8;" | <small>Unknown<br>chemical<br>properties</small>
|-
| rowspan=2 style="background: #ff6666;" | Alkali metals 
| rowspan=2 style="background: #ffdead;" | Alkaline earth metals
| colspan=2 style="background: #f7f7e9;" | Inner transition metals
| rowspan=2 style="background: #ffc0c0;" | Transition metals 
| rowspan=2 style="background: #cccccc;" | Post-transition metals
| rowspan=2 style="background: #a0ffa0;" | Other nonmetals
| rowspan=2 style="background: #ffff99;" | Halogens 
| rowspan=2 style="background: #c0ffff;" | Noble gases
|-
| style="background: #ffbfff;" | Lanthanides 
| style="background: #ff99cc;" | Actinides
|}

==External links==
*[http://www.scientificamerican.com/article.cfm?id=chemistry-the-elements-revealed-interactive-periodic-table Interactive version]
*[http://www.theodoregray.com/PeriodicTable/ The world's most awesome Periodic Table display].
*[https://www.youtube.com/watch?v=rz4Dd1I_fX0 The Periodic Table Song]
*[http://mr.powner.org/c/lessons/c_images/periodic_table/pt_expanded.svg It should really look like this.]

==References==
{{reflist}}
[[Category:Chemistry]]
[[Category:Elements| ]]

Categories: Chemistry, Elements