Elements, Atoms, Molecules, and Compounds

What is the center of an atom called, where protons and neutrons are located?

• Electron cloud

• Nucleus

• Orbitals

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NGSS.MS-PS1-1

Which of the following is a molecule made up of two hydrogen atoms and one oxygen atom?

• Carbon dioxide

• Water

• Methane

• Oxygen

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What is the term for a substance made of only one type of atom?

• Compound

• Mixture

• Element

• Solution

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How many protons does an atom of carbon have?

• 6

• 8

• 12

• 14

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NGSS.MS-PS1-1

Which of the following represents the number of protons in an atom?

• Atomic mass

• Atomic number

• Valence number

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What is the smallest unit of a chemical element that retains its chemical properties?

• Molecule

• Atom

• Compound

• Mixture

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• 1

• 2

• 3

• 4

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Which of the following best describes a compound?

• A substance made of two or more different types of atoms chemically combined

• A single atom of one element

• A substance made of two or more atoms chemically combined

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• 12

• 24

• 18

• 36

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How many electrons does an atom of chlorine have?

• 35

• 16

• 17

• 18

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NGSS.MS-PS1-1