Front

The second energy shell of an atom can hold up to ______ electrons.

Back

8

Front

The building blocks of all matter are called ________.

Back

atoms

Front

Electrons fill the energy shells of an atom to make the molecule less stable. True or False?

Back

False

Front

Fungi and other decomposers break down nitrogen-rich waste and put it back into the ______.

Back

soil

Front

An atom that is negatively or positively charged because it has lost or gained one or more electrons is called a(n) ____________.

Back

ion

Front

What is the smallest unit of life that can function independently?

Back

cell

Front

What are the three main parts of an atom?

Back

protons, neutrons, electrons

Front

What is the charge of a proton?

Back

positive

Front

What is the charge of an electron?

Back

negative

Front

What is the charge of a neutron?

Back

neutral