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Science
| Question | Answer |
|---|---|
| element | a fundamental material consisting of only one atom |
| periodic table | a chart in which all known elements are organized by their properites |
| atomic symbol | an abbreviation for an element or atom |
| atomic nucleus | the dense, positively charged center of every atom |
| electron | an extremely small, negatively charged subatomic particle found outside the atomic nucleus |
| proton | a positively charged subatomic particle of the atomic nucleus |
| atomic number | a count of the number of protons in the atomic nucleus |
| neutron | an electrically neutral subatomic particle of the atomic nucleus |
| nucleon | any subatomic particle found in the atomic nucleus, another name or either proton or neutron |
| isotope | atoms of the same element whose nuclei contain the same number of protons but different numbers of neutrons |
| mass number | the number of nucleons (protons and neutrons) in the atomic nucleus. used primarily to identify isotopes |
| atomic mass | the mass of |
| metal | an element that is shiny, opaque, and able to conduct electricity and heat |
| non metal | an element located toward the upper right of the periodic table and is neither a metal nor a metalliod |
| metalliod | an element that exhibits some properties of metals and some properties of nonmetals |
| period` | the horizontal rows |
| group | the vertical columns |
| periodic trend | gradual change of any property in the elements across a period |
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