Chapter 4 Modern Chemistry

Electrons are located outside the nucleus of an atom.

• True
• False

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NGSS.MS-PS1-1

What is an atomic number?

• The number of protons in an element
• The number of neutrons in an element
• The number of protons and neutrons.
• The number of protons and electrons.

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What is the atomic number of an element with 12 protons, 13 neutrons and 12 electrons?

• 12
• 13
• 25
• 24

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Changing the number of electrons in an atom results in the formation of :

• positive ion only
• positive  ion or negative ion
• negative ion only
• new atom

Changing the number of neutrons in an atom results in the formation of a(an) _______

• atom
• isotope
• anion ( a negative ion)
• cation (a positive ion)

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NGSS.MS-PS1-1

How many protons are in an atom of carbon?

• 12.01
• 8
• 6
• 14

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How many electrons does a neutral carbon atom have?

• 0
• 2
• 14
• 6

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NGSS.MS-PS1-1

How many electrons does a neutral carbon atom have?

• 0
• 2
• 14
• 6

Examine the label of the atom. Which is an electron?

• A
• B
• C

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NGSS.MS-PS1-1

An element can be defined by the number of ___________ in the nucleus of its atoms.

• protons
• neutrons
• electrons
• atoms