Exploring Atomic Structure and Subatomic Particles

What is the atomic number of carbon?

• 12

• 6

• 14

• 4

How many valence electrons does carbon have?

• 4

• 2

• 8

• 6

Which group in the periodic table contains elements with 7 valence electrons?

• Group 1A

• Group 2A

• Group 4A

• Group 7A

What is the charge of a neutron?

• Positive

• Negative

• Variable

• Neutral

What force holds the nucleus together?

• Magnetic force

• Gravitational force

• Strong nuclear force

• Electric force

How many protons does an aluminum atom have?

• 14

• 27

• 13

• 10

What is the net charge of an aluminum ion with 10 electrons?

• 0

• +10

• +3

• -3

How many neutrons are in a phosphorus atom with a mass number of 31?

• 15

• 16

• 31

• 46

What is the predominant isotope of carbon?

• Carbon-12

• Carbon-13

• Carbon-14

• Carbon-15

How do you calculate the average atomic mass of an element?

• Sum of protons and neutrons

• Average of atomic numbers

• Weighted average of isotopes' masses

• Sum of all isotopes' masses