Atoms of elements in the same group of the periodic table share the same

• number of energy levels

• number of valence electrons

• atomic numbers

• atomic masses

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is an atom’s nucleus made of?

• protons and electrons

• protons only

• protons and neutrons

• neutrons only

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NGSS.HS-PS1-8

How many electrons will a neutral atom of carbon have if its nucleus has 6 protons and 8 neutrons?

• 2

• 6

• 8

• 14

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NGSS.HS-PS1-1

An element with 5 protons, 6 neutrons, and 8 electrons has an atomic number of

• 5

• 6

• 8

• 11

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NGSS.MS-PS1-1

An element with 5 protons, 6 neutrons, and 8 electrons has a mass number of

• 5

• 6

• 8

• 11

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NGSS.MS-PS1-1

The farther an electron is from the nucleus, the more it has

• charge

• energy

• mass

• size

Atoms of the same element that have different numbers of neutrons are called

• molecules

• ions

• protons

• isotopes

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NGSS.HS-PS1-8

The total number of electrons in the outer shell of a sodium atom is

• 1

• 2

• 8

• 18

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NGSS.HS-PS1-1

Which particles determine the atomic number of an element?

• Protons only

• Neutrons and protons

• Neutrons only

• Protons and electrons

The total number of neutrons in the nucleus of any atom is equal to the

• mass number of the atom

• atomic number of the atom

• atomic number minus the mass number

• mass number minus the atomic number