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Chap. 4 Atomic Struc
Chap. 4 Atomic Structure
Question | Answer |
---|---|
atom | the smallest particle of an element that retains its identify in a chemical reaction |
atomic mass unit | defined as 1/12 the mass of a carbon-12 atom |
atomic number | the number of protons in the nucleus of an atom of an element |
electron | a negatively charged subatomic particle found in the energy levels surrounding the nucleus |
group | a vertical column of elements in the periodic table; contains elements with similar properties |
isotope | atoms of the same element that have the same atomic number but different atomic masses |
neutron | a subatomic particle with no charge and a mass of 1 amu; found in the nucleus of the atom |
nucleus | tiny, dense central portion of the atom, composed of protons and neutrons |
periodic table | an arrangement of elements in which the elements are separated into groups based on a set of repeating properties |
proton | a positively charged subatomic particle found in the nucleus of an atom |