8th grade Atoms & The Periodic Table

1. This subatomic particle always identifies the identity (name) of the element

• Neutron

• Proton

• Electron

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2. The chart that shows the arrangement of elements in order by their atomic number

• Electron Cloud

• Periodic Table

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• Atomic Mass

3. The sum of the protons and neutrons in the nucleus of an atom

• Atomic Number

• Compound

• Electrons

• Mass Number (also called Atomic Mass or Weight)

4. The vertical columns on the periodic table #1-18

• Groups

• Periods

• Subatomic Particles

• Rows

5. The majority of elements are classified as ________ and are located on the left side/middle of the periodic table.

• Metals

• Noble Gases

• Nonmetals

• Metalloids

6. A "pure" substance that cannot be separated or broken down into simpler substances

• Compound

• Mixture

• Period

• Element

7. Most of these elements are gases and are located on the right side of the periodic table

• Metalloids

• Nonmetals

• Metals

• Compounds

8. A substance composed of two or more elements chemically bonded together. Examples are H₂O and CO₂.

• Element

• Compound

• Metalloid

• Electron Cloud

9. The horizontal rows on the periodic table #1-7

• Periods

• Element

• Atomic Number

• Group

10. These elements are found along the zig-zag line on the periodic table.

• Metal

• Metalloid

• Group

• Nonmetal