Science 7 Introduction to Atoms, Elements, Periodic Chart
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10 terms
Terms | Definitions |
|---|---|
 nucleus | very small center core of an atom, contains protons and neutrons |
| proton | particle inside a nucleus, has a positive electric charge |
| neutron | particle inside a nucleus, has no charge; atomic mass minus # of protons |
| electron | particle outside a nucleus, has a negative charge |
| atomic number | the number of protons(electrons) in the nucleus |
| atomic mass | the sum of the protons and neutrons |
| periodic table | a chart of the elements showing the repeating pattern of their properties |
| chemical symbol | a one- or two-letter representation of an element |
| period | a horizontal row of elements in the periodic table |
| group | elements in the same vertical column of the periodic chart |
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