Practice Unit 1 quiz 2 atomic calculations

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the atomic number of this nucleus?

• 1
• 3
• 4
• 7

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What is the atomic number of this atom?

• 4
• 5
• 9
• none of the above

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This particle determines what element you have - the elements identity.

• electron
• proton
• neutron
• valence shell

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The fluorine atom has an atomic number of

• 19

• 9

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What is the mass number and atomic number ?

• Mass number = 7, atomic number = 14

• Mass number = 14, atomic number = 7

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What is neutron number?

• the number of neutrons in the nucleus of an atom, equal to the mass number plus the atomic number of the atom

• the number of neutrons in the nucleus of an atom, equal to the mass number minus the atomic number of the atom

The atomic number of Nitrogen (N) is

• 7

• 6

• 8

• 9

The atomic number of Cobalt (Co) is

• 27

• 26

• 25

• 24

How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)

• Sodium has 1 proton.

• Sodium has 3 protons.

• Sodium has 11 protons

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