Exploring Atomic Number and Mass Number in Isotopes

What does the atomic number (Z) represent in an atom?

• The number of protons

• The number of neutrons

• The number of electrons

• The atomic mass

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

• Electrons

• Neutrons

• Isotopes

• Nuclei

Which isotope of hydrogen has one neutron in its nucleus?

• Protium

• Deuterium

• Tritium

• Hydrogen-1

How many neutrons does tritium have?

• One

• Three

• Zero

• Two

What is the mass number (A) of an isotope?

• The number of protons

• The number of neutrons

• The atomic number

• The sum of protons and neutrons

How is the mass number of deuterium represented?

• 1

• 2

• 3

• 4

For carbon-12, how many neutrons are present?

• 24

• 18

• 12

• 6

What is the atomic number of carbon?

• 13

• 12

• 6

• 14

In carbon-13, how many neutrons are there?

• 8

• 6

• 7

• 5

How many neutrons are in uranium-235?

• 235

• 143

• 327

• 92