True or False: Mass Number, Atomic Number, Atomic Mass & Isotope

The atomic number tells us how many protons are in an atom.

• True

• False

All atoms of the same element must have the same atomic number.

• True

• False

The mass number is found by adding the number of protons and electrons.

• True

• False

Atomic mass is a decimal number because it is an average of isotopes.

• True

• False

Isotopes are atoms of the same element with different numbers of neutrons.

• True

• False

Isotopes have different atomic numbers.

• True

• False

The mass number is always shown as a decimal on the periodic table.

• True

• False

You can calculate the number of neutrons by subtracting the atomic number from the mass number.

• True

• False

Atomic mass is usually close to the mass number of the most common isotope.

• True

• False

All isotopes of an element must have the same mass number.

• True

• False