Parts of the atom

Front

What is the mass of a proton?

Back

1 amu

Front

What is the mass of a neutron?

Back

1 amu

Front

What is the mass of an electron?

Back

0 amu

Front

What charge does a proton have?

Back

+1

Front

What charge does a neutron have?

Back

Neutral

Front

What charge does an electron have?

Back

-1

Front

Why are electrons important in an atom?

Back

They determine chemical reactivity.

Front

How many valence electrons does the nitrogen family (Group 15) have?

Back

5

Front

If an atom has 13 protons, how many electrons does it have if it is neutral?

Back

13

Front

What is the definition of an atom?

Back

The smallest unit of matter that retains the properties of an element.