Atoms and Periodic Table Practice

What is at the top of each square in the periodic table?

What is the horizontal row of elements called on the periodic table?

Who developed the first atomic theory that all matter is made up of atoms that cannot be created, divided or destroyed?

Which scientist thought that atoms are solid positive sphere with electrons on the outside?

Who discovered that atoms have a nucleus and later discovered protons in an atom?

Which scientist discovered that atoms had neutrons and have an elctron cloud?

What particles of the atom have no charge?

If an atom has equal numbers of protons and electrons it is said to have a ________ charge.

Which particles in an atom are negatively charged?

What is the term for the current thinking that electons move around the outside of the nucleus?