9 - 3.2: review

An atom contains 6 protons, 8 neutrons, and 6 electrons. What would it be?

• Carbon-14
• Carbon-12
• Oxygen-14
• More than one answer is correct

Deuterium is the isotope of hydrogen. The mass number of the deuterium isotope is

• 2
• 1
• 3
• 4

A tritium has _____ neutrons and a mass of 3 amu.

• 2
• 5
• 7
• 4

All three of the isotopes of hydrogen have _____ proton(s).

• 1
• 2
• 3
• 4

Atoms need a certain ratio of neutrons to protons for the nucleus to be stable. Too many or too few neutrons can make it radioactive, which means it is unstable and will decay in order to have a more stable neutron to proton ratio.

• true
• false

How many protons are present in germanium if its atomic mass is 72 and the number of neutrons is 40?

• 30
• 32
• 40
• 42

The mass number is the number of protons plus electrons in an atom.

• true
• false

Isotopes have different numbers of ________.

• protons
• neutrons

Isotopes of an element generally have the same physical and chemical properties because they have the same numbers of ________.

• protons
• neutrons

All isotopes are radioactive.

• false
• true