4.1 & 4.2 Quiz (The Atom and its Structure)

What do you call atoms that have the same number of protons but different number of neutron

What TWO particles equal the Mass Number?

Thomson's cathode ray experiment includes

Which of the scientists added the NEGATIVELY charged particle to the model of an atom?

In 1911, Rutherford and his crew were surprised by the outcome of the experiment because

The _________ is the very dense center of an atom that contains the protons and neutrons.

Atoms want to stay balanced so the number of __________ is equal to the number of ______

Democritus' theory of the atom were not useful as they were not based on the scientific method

Where are electrons located in an atom?

The modern process of discovery about the atom began with

Current Atomic Theory suggests that the electrons move within an area around the nucleus called

Where are protons located in an atom?

What number defines the atom?

These atoms represent a 

Where are neutrons located in an atom?

Which subatomic particle is the lightest (i.e. least massive)?