NGSS.MS-PS1-1

What is the atomic number of an atom with 13 protons, 14 neutrons, and 10 electrons? 

• 1
• 13
• 27
• 37

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Fe₂

• Compound

• Element

• Mixture

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What is the center of an atom called?

• nucleus

• electron cloud

• proton center

• photon center

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An example of ...

• A mixture
• A compound
• An element 

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What is an electron cloud?

• It contains the protons and neutrons

• It surrounds the nucleus and contains the electrons

• It is the basic building block of all matter

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Which subatomic particles make up the mass of the atom

• neutrons and electrons

• proton and neutrons

• electron and protons

• none of the above

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Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

Answer explanation

The electrons are found in the energy levels of the electron cloud surrounding the nucleus.

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This picture represents: 

• Element
• Compound
• Mixture of Elements
• Mixture of Compounds

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In a neutral atom,

• protons = electrons

• protons = neutrons

• neutrons = electrons

• protons = neutrons = electrons

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• 1

• 2

• 3

• 4

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