THE PERIODIC TABLE - Introduction

How many protons are present in an atom of carbon-12?

• 6

• 12

• 18

• 24

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DOK Level 2: Skill/Concept

If an atom has 15 protons, 16 neutrons, and 15 electrons, what is its atomic number?

• 15

• 16

• 31

• 46

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DOK Level 2: Skill/Concept

An atom has an atomic number of 8 and an atomic mass of 16. How many neutrons does it have?

• 8

• 16

• 24

• 32

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DOK Level 2: Skill/Concept

Which of the following elements has 11 protons?

• Sodium

• Magnesium

• Potassium

• Calcium

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DOK Level 2: Skill/Concept

Calculate the number of electrons in a neutral atom of chlorine, which has an atomic number of 17.

• 17

• 18

• 35

• 52

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DOK Level 2: Skill/Concept

If an atom has 26 protons and 30 neutrons, what is its atomic mass?

• 26

• 30

• 56

• 86

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DOK Level 2: Skill/Concept

Which of the following statements is true about a neutral atom?

• The number of protons is equal to the number of electrons.

• The number of protons is equal to the number of neutrons.

• The number of neutrons is equal to the number of electrons.

• The number of protons is greater than the number of electrons.

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DOK Level 2: Skill/Concept

An atom has 14 protons, 14 electrons, and 14 neutrons. What is its atomic mass?

• 14

• 28

• 42

• 56

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DOK Level 2: Skill/Concept

Which element has an atomic number of 3?

• Helium

• Lithium

• Beryllium

• Boron

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DOK Level 2: Skill/Concept

What is the center of an atom containing protons and neutrons?

• nucleus

• neutron

• proton

• electron cloud

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NGSS.MS-PS1-1