Understanding Atomic Structure and Ions

What is the atomic number of an element?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of protons and neutrons

• The number of electrons in the atom

How do you calculate the mass number of an atom?

• Atomic number + number of electrons

• Number of protons + number of electrons

• Atomic number + number of neutrons

• Number of neutrons + number of electrons

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

• 15

• 16

• 31

• 29

In a neutral atom, the number of protons is equal to the number of:

• Neutrons

• Electrons

• Ions

• Nuclei

What is the charge of an ion with 12 protons and 10 electrons?

• +2

• -2

• +1

• -1

Which of the following represents the number of neutrons in an atom with a mass number of 40 and an atomic number of 18?

• 18

• 22

• 40

• 58

What is the symbol for an aluminium atom with 13 protons and 14 neutrons?

If an atom has an atomic number of 20 and a mass number of 40, how many neutrons does it have?

• 20

• 40

• 60

• 0

What happens to an atom when it loses an electron?

• It becomes a negative ion

• It becomes a positive ion

• It becomes neutral

• It gains a neutron

How many electrons are present in a neutral atom with an atomic number of 8?

• 8

• 16

• 4

• 0