SI unit of time is_________
Elements are made of _________
____________ have no charge
___________are negatively (_) charged particles of an atom
_____________ are positively (+) charged particles
The protons and neutrons are found in the center of the atom, which is called the _________of the atom
What are the three subatomic particles of an atom
What are considered the building blocks of matter
All matter is made of ___________
_________ is anything that takes up space and has mass
