Protons, Neutrons, and Electrons Practice

How many of each subatomic particle does Magnesium-28 have?

• protons= 12, neutrons= 16, electrons= 12

• protons= 12, neutrons= 28, electrons= 16

• protons= 16, neutrons= 28, electrons= 16

• protons= 16, neutrons= 12, electrons= 16

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

• 6

• 10

• 4

• 8

How many protons, neutrons, and electrons does this copper atom contain?

• 29 protons, 34 neutrons, 29 electrons

• 29 protons, 63 neutrons, 29 electrons

• 34 protons, 29 neutrons, 34 electrons

• 34 protons, 63 neutrons, 34 electrons

How many protons, neutrons, and electrons does this helium atom have?

• 2 protons, 2 neutrons, 2 electrons

• 2 protons, 4 neutrons, 2 electrons

• 4 protons, 2 neutrons, 2 electrons

• 2 protons, 2 neutrons, 4 electrons

How many protons does Chlorine have?

• 17

• 35

• 18

• 39

How many neutrons does Uranium-238 have?

• 92

• 146

• 238

• 149

How many electrons does the K⁺¹ have?

• 19

• 20

• 18

• 39

How many electrons does the O^-2 have?

• 8

• 10

• 6

• 16

How many protons does lithium have?

• 3

• 4

• 7

• 36

An element has the mass number 41 and atomic number 20. The number of neutrons in it is:

• 21

• 20

• 41

• 40