[DOC] [TLE] Overview of Atomic Structure - Boundless [PAR] Atoms are made up of particles called protons, neutrons, and electrons, which 
are responsible for ... Neutrons are uncharged particles found within the nucleus. 
... It is equal in mass to a proton or it weighs 1 amu. ... For example, water is 
composed of hydrogen and oxygen atoms that have combined to form water 
molecules. [DOC] [TLE] Basic Chemistry [PAR] Of the 90 or so elements found on the earth six make up 99% of living matter? 
These are ... You should familiarize yourself with these elements and learn about 
their roles over the next month. ... Water has 2 parts hydrogen to one part oxygen. 
... The most common isotope of hydrogen has a proton but lacks a neutron. It is 
the... [DOC] [TLE] Atomic Mass - Windows to the Universe [PAR] This picture explains the idea of "atomic mass". ... It has 1 proton plus 2 neutrons 
in its nucleus. ... Almost all of the mass of an atom (more than 99%) is in its 
nucleus, ... The nucleus of an atom is made up of protons and neutrons. ... Each 
element (like carbon or oxygen or gold) has a different number of protons in its 
atoms. [DOC] [TLE] Atom - Wikipedia [PAR] An atom is the smallest constituent unit of ordinary matter that has the properties 
of a chemical ... The nucleus is made of one or more protons and typically a 
similar number of neutrons. ... The number of neutrons defines the isotope of the 
element. .... The constituent particles of an atom are the electron, the proton and 
the... [DOC] [TLE] The Parts of the Periodic Table - Angelo State University [PAR] Information about various chemical compounds and elements. ... The alkali 
metals (again, except for hydrogen) react vigorously with water, producing ... or 
88% of all of the atoms of the universe); hydrogen and helium together make up 
99% of ... Hydrogen-2, or deuterium, contains one proton and one neutron in its 
nucleus,... [DOC] [TLE] Matter & Energy [PAR] the matter in all non-living and living things is made up of chemicals; at every 
level, ... 9 elements constitute ~99% (by mass) of the earth's crust; except for 
oxygen, ... formula for water is H-O-H; Each element consists of one kind of atom, 
which is ... in atoms with more than 2 electrons, the remainder of the electrons are 
found... [DOC] [TLE] Elements in the Human Body and What They Do [PAR] May 20, 2015 ... Nearly 99% of the mass of your human body consists of just 6 chemical ... 
Another 5 elements make up most of the last percentage point: ... Atomic Number: 
1 ... with oxygen to form water, H2O. Hydrogen, like carbon, is found in every ... 
Hydrogen also acts as a proton or positive ion in chemical reactions. [DOC] [TLE] Questions and Answers - How many atoms are in the human body? [PAR] Hydrogen, oxygen and carbon make up about 99% of the average human. ... a 
little and leave out the other 1%, which is made up of trace elements (that is, ... on 
the number of atoms, not percent of body weight (by weight we are mostly oxygen
). ... Of that, 4.7*1027 would be hydrogen atoms, which have one proton and one
... [DOC] [TLE] Atomic theory: atoms, elements, nucleus - Chem1 [PAR] May 13, 2016 ... The idea of the atom  at one time a theory, but now directly ... 2 The Chemical 
elements ... us are the four elements "earth, air, fire and water" that were 
popularized by Greek .... The numbers in Line are just the mass ratios of O:N, 
found by ... If compounds are made up of definite numbers of atoms, each of... [DOC] [TLE] Nuclear Magnetic Resonance - Magnetic Resonance Imaging [PAR] Even though most chemical elements have one or more isotopes with ... by three 
factors: (1) tissue concentration of the element;

Question: One proton makes up over 99% of the mass of an atom of this element, 2 of which are found in water
Answer: Hydrogen