warning

Content guidance

Depiction or discussion of violence or suffering

Adult supervision required

quiz

Exit Quiz

Question 1 of 6
1 of 6
Match the term to its definition.
move-arrows
Click and drag answers to change the order, or select using Tab then move by pressing Space and the arrows on your keyboard.
subatomic particles with a mass of 1 and a positive charge
total number of protons and neutrons in an atom
atoms of an element with different number of neutrons
subatomic particles with a mass of 1 and no charge
protons
mass number
isotopes
neutrons
Two subatomic particles are in the nucleus and make up the mass of the atom. One of these cannot change in number as it defines the element while the other one can.