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Chem unit 2
Term | Definition |
---|---|
Alkali metals | Group 1 on the periodic table. Highly reactive! |
Alkaline earth metals | Group 2 on the periodic table. Highly reactive! |
Atom | Most basic unit of matter |
Atomic number | Number of protons in an atom of that element |
Average atomic mass | the weighted average mass of the atoms in a naturally occurring sample of the element |
Electron affinity | The likelihood of an element to attract an electron |
Electrons | Negatively charged particles in an atom |
Families | a group of elements that have certain similar properties and can form compounds with some similar properties |
Halogens | Group 17 on the periodic table. Highly reactive! |
Mass number | The total number of protons and neutrons in the nucleus |
Neutrons | Neutral particles located in the nucleus of an atom |
Noble gases | Group 18 of the periodic table. Non-reactive. |
Nucleus | Positively charged center of an atom |
Oxidation numbers | number of electrons an atom can accept or donate to form a bond with another atom |
Protons | Positive particles located in the nucleus of an atom |
Subatomic particles | Particles inside an atom |
Transition metals | Groups 3-12. Good conductors. |