NEED HELP!!!
Match the following words with their definitions.




1.
number of protons in an atom
neutron

2.
negatively charged particle circling nucleus
nucleus

3.
matter made up of just one type of atom
element

4.
building block of matter
proton

5.
neutrally charged particle nucleus
atomic number

6.
center of the atom made up of protons and neutrons
electron

7.
positively charged particle in the nucleus
atom