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The Atom
Atom Study guide
Term | Definition |
---|---|
Atom | The basic particle from which all elements are made |
electrons | A tiny, negatively charged particle that moves around the outside of the nucleus of the atom |
nucleus | The center core of an atom which contains protons and neutrons |
protons | Small, positively charged particles that are found in the nucleus of an atom |
energy level | A region of an atom in which electrons of the same energy are likely to be found |
neutron | a small particle in the nucleolus of an atom, with no electrical charge |
atomic number | The number of protons in the nucleus of an atom |
isotopes | An atom with the same number of protons and a different number of neutrons from other atom of the same element |
mass number | The sum of protons and neutrons in the nucleus of an atom |
atomic mass | The average mass of all the isotopes of an element |
periodic table | An arrangement of the elements showing the repeating pattern of their properties |
chemical symbol | A one- or two-letter representation of an element |
periods | A horizontal row of elements I the periodic table |
group | Elements in the same vertical column of the periodic table; also called family |