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Atoms
Chemistry
Term | Definition |
---|---|
Electron | A tiny, negatively charged particle that moves around the outside of the nucleus of an atom |
Nucleus | In cells, a large oval organelle that contains the cell's genetic material in the form of DNA |
Proton | 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 nucleus of an atom, with no electrical charge |
Atomic Number | The number of protons in the nucleus of an atom |
Isotope | An atom with the same number of protons and a different number of neutrons from other atoms 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 |
Chemical Symbol | A one-or two-letter representation of an element. |
Group | Elements in the same vertical column of the periodic table; also called family |
Periodic table | An arrangement of the elements showing the repeating pattern of their properties |
Period | A horizontal row of elements in the periodic table. |
Atom | The basic particle from which all elements are made; the smallest particle of an element. |