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Atoms lesson
Atoms lesson vocabulary practice
Term | Definition |
---|---|
Atoms | smallest particle of matter |
Nucleus | center of an atom |
Protons | positively charged particles found in the nucleus |
Neutrons | neutrally charged particles found in the nucleus |
Electrons | negatively charged particles found outside the nucleus |
Atomic number | the number of protons in the nucleus of an atom |
Mass number | number of protons plus the number of neutrons in the nucleus of an atom (can also be called Atomic Mass) |
Ion | an atom that gains or loses an electron |
Anion | an atom that is negatively charged because it gains electrons |
Cation | an atom that is positively charged because it looses electrons |
Isotopes | atoms of the same element with different numbers of neutrons |
Elements | building blocks of matter/made of atoms |
Molecules | two or more atoms of an element that are joined together |