Drag each answer to the correct box.
mass number1 of 11 draggables.
+12 of 11 draggables.
neutrons3 of 11 draggables.
atomic number4 of 11 draggables.
protons5 of 11 draggables.
neutrons6 of 11 draggables.
electrons7 of 11 draggables.
atomic number8 of 11 draggables.
-19 of 11 draggables.
010 of 11 draggables.
mass number11 of 11 draggables.
A proton has a charge of , and an electron has a charge of . Neutrons have a charge of . Protons have the same mass as but both are much heavier than .
In the nucleus, repel each other because they have the same charge, but keep the nucleus together.
An element's refers to the number of protons it contains. The is the total number of protons and neutrons in the nucleus. Atoms of the same element always have the same but isotopes of that element will have a different .