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Glossary of Elements and atoms

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Matter
anything that occupies space and has mass
chemical symbol
names of elements are commonly identified by thier
carbon, hydrogen, oxygen, nitrogen
4 elements that make up 96% of the bodys weight
nucleus and shells
The two basic regions of structural organization of the atom
protons and neutrons (except an atom of hydrogen
The nucleus contains the atom's
electrons (except an atom of hydrogen (H) which only has one electron)
The shells contain
p+
The symbol and charge of a proton is
protons
In the naturally occurring elements, the number of electrons is equal to the number of
n0
The symbol and charge of a neutron is
13
The mass number of an atom (carbon) that has six protons and seven neutrons is
isotopes
Atoms of the same element that have different numbers of neutrons are called
e-
The symbol and charge of an electron is
zero
The charge of naturally occurring elements is
O-2
An oxygen atom that has gained two electrons is written as
Na+
A sodium atom that has lost one electron is written as

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