Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.

Protons have positive charges, and electrons have negative charges. When an atom has an equal number of the two particles, the atom has no net charge. If an atom loses an electron, it has one more proton than electron, giving it a net positive charge. An ion with a net positive charge is called a cation. If an atom gains an electron, then it has one more electron than proton, giving it a net negative charge. An ion with a net negative charge is called an anion. Learn more about Atoms & Molecules Calcium atom with electron arrangement K (2),L(8),M(8),N(2) loses two electrons from its outermost shell ( N shell) and forms positive ions called Calcium , #Ca^ (2+)# ion. Oxygen atom with electron arrangement K (2),L(6), gains two electrons from its outermost shell ( L shell) and forms negative ions called oxide , #O^ (2-)# ion. A: A nucleophilic attack is a chemical process by which an electron-rich atom or nucleus rapidly forms a new bond with an electron-poor atom or positive ion. ... Full Answer > Filed Under: Jun 29, 2014. An atom becomes an Ion (a) if it gains one or more electron(s) or (b) if it loses one or more electron(s). When it gains electrons it becomes negatively charged and is called an anion. When it loses electron(s) it becomes positively charged and is called a cation. An atom can become a positive ion, or a cation (cat-ion), when it gives away one or more electrons. An atom becomes a negative ion, or an anion (an-ion), when it gains one or more electrons. Atoms that do this do not have completely filled valence shells, and are therefore reactive. A calcium atom becomes a calcium ion by losing two electrons. Electrons are negatively charged, so losing two electrons creates an ion with a charge of... A calcium atom becomes a calcium ion by losing two electrons. Electrons are negatively charged, so losing two electrons creates an ion with a charge of 2+. Continue Reading A: A bicarbonate ion is a negatively charged molecule consisting of one carbon, three oxygen and one hydrogen atom. A bicarbonate ion is an intermediate produ... Full Answer > An atom becomes an ion when it loses or gains an electron. An atom is electrically neutral. The protons and electrons are equal and balance each other. An ion is either positive or negative, depending on whether it gains or loses an electron. A calcium atom becomes a calcium ion by losing two electrons. Electrons are negatively charged, so losing two electrons creates an ion with a charge of 2+. According to the octet rule, atoms gain or lose electrons to fill their outer energy levels. This helps them achieve noble gas configuration. Calcium is atomic number 20 on the periodic table. Its nearest noble gas is argon, which has an atomic number of 18. To achieve argon's electron configuration, calcium needs to lose two electrons. When it does this, it becomes a positively charged ion. Although calcium is in the same period as the noble gas krypton, the calcium never attempts to attain krypton's electron configuration. This is because it takes less energy to lose two electrons than it would to gain six electrons and fill the outer energy level. Normally, an atom has the same number of positive particles (protons) and negative particles (electrons). 1 So the number of protons is identical to the number of electrons, and both are identical to the atomic number. 2 An ion with more electrons than protons carries a net negative charge and is called an anion. Query: how does an atom become an ion
An atom becomes an ion, if it gains one or more electron or electrons or, if it loses one or more electron or electrons.