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Unit 3: Lesson 1-2
This will help me get a great grade on finals!!!
Term | Definition |
---|---|
Atom | The smallest particle into which an element can be divided and still be the same element. |
Electron | Negatively charged particles in an atom. |
Nucleus | Center of an Atom that has a positive charge that is surrounded by electrons. |
Proton | Positively charged particles in the nucleus. |
Neutron | Uncharged particles in the nucleus. |
Electron Cloud | Electrons move within an area around the nucleus. (Theory) |
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 | Mendeleev's arrangement of the elements. |
Chemical Symbol | An abbreviation for the element's name. |
Average Atomic Mass | The weighted average of the masses of all the naturally occurring isotopes of that element. |
Metal | Elements that are shiny and conduct heat and electricity well. |
Nonmetal | Poor conductors of head and electricity. |
Metalloid | Elements that have some properties of metals and some properties of nonmetal. |
Group | Each vertical column of elements on the periodic table. |
Period | Each horizontal row of elements on the periodic table. |