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| atom |
the smallest part of an element with all the properties of the element |
| element |
fundamental material consisting on only one type of atom |
| nucleus |
core of the atom; has protons and neutrons |
| proton |
positively charged particle in the nucleus |
| neutron |
particle in the nucleus; no charge |
| electron |
negatively charged particles in an atom; in orbitals around the nucleus |
| atomic number |
identifies the element; number of protons |
| atomic mass number |
number of protons plus neutrons in the nucleus |
| isotope |
atoms with the same number of protons, different number of neutrons |
| group |
vertical column in the periodic table |
| period |
horizontal row in the periodic table |
| metal |
most elements of the periodic table; generally shiny, opaque, malleable |
| metalloid |
one of six elements with properties of both metals and non-metals |
| non-metal |
element that is not malleable, not ductile, poor conductor |
