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bhspsvoc2
Physical Science - Unit 2 Vocabulary
Term | Definition |
---|---|
atom | smallest particle of an element that still has the properties of the element |
element | substance is which the atoms are the same, chemical |
periodic table | organized table of elements |
Mendeleev | developed the periodic table of elements in the late 1800's |
Dalton | developed the atomic theory |
nucleus | center of the atom, positively charged |
proton | positively charged particle in an atom (p) |
electron | negatively charged particle in an atom (e-) |
neutron | part of an atom with no charge, neutral (n) |
electron cloud | around the nucleus where are electrons are found |
atomic number | number of protons in an atom |
atomic mass | number of protons and neutrons in an atom |
isotope | same element but has a different mass because it has a different number of neutrons |
electron dot diagram | shows number of electrons in the outer level of an atom |
valence electrons | electrons in the outer shell of an atom |