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Unit 3, Lesson 1, 2
Question | Answer |
---|---|
Atom | The smallest particle into which an element can be divided and still be the same element. |
Electron | Negatively charged particles |
Nucleus | A small, dense center that has a positive charge and is surrounded by moving electrons |
Proton | Positively charged particles |
Neutron | Uncharged particles |
Electron Cloud | Area around the nucleus |
Atomic Number | The number of protons in the nucleus of an atom |
Mass Number | The total number of protons and neutrons in an atom's nucleus |
Periodic Table | Arrangement of elements |
Chemical Symbol | Abbreviation for an element's name |
Average Atomic Mass | Weighted average of the masses |
Metal | Elements that are shiny |
Nonmetal | Poor conductors of heat and electricity |
Metalloid | Elements that have some properties of metals and nonmetals |
Group | Column of elements |
Period | Horizontal row of elements7 |