Isotopes

Isotopes of an element contain an equal number of protons but a different number of ____________________.

• neutrons

• electrons

• atomic numbers

How many protons are in the isotope pictured above?

• 29

• 34

• 63

• 92

How many neutrons are in the isotope pictured above?

• 29

• 34

• 63

• 92

The mass number of an isotope is made up of which subatomic particles?

• protons and electrons

• protons and neutrons

• electrons and neutrons

• protons, neutrons and electrons

What is the number of protons in phosphorus-31?

• 15

• 16

• 31

• 46

The atomic number of an element is the total number of which subatomic particle found in the nucleus?

• Electron

• Neutron

• Proton

• Neutrons + Protons

Element X has 13 neutrons with a mass number of 28. Element Y has 13 protons. These elements are:

• Different elements

• Isotopes

Element Q has 56 protons and 18 neutrons.

Element R has 56 protons and 17 neutrons. These elements are:

• different elements

• isotopes

What is the mass number of an element with 11 protons and 12 neutrons?

• 1

• 11

• 12

• 23

How many electrons are in a neutral atom of magnesium?

• 10

• 12

• 24

• 24.3