Atomic Theory Test

JJ Thomson used a cathode ray tube to discover what about the atom.

• The atom is mostly empty space

• The atom has a positive, solid core called a nucleus

• Atoms have electrons that have a negative charge

• Atoms have electrons that have a positive charge.

Rutherford discover what about the atom when most of the alpha particles went straight through the gold foil.

• The atom is mostly empty space

• The atom has a positive, solid core called a nucleus

• Atoms have electrons that have a negative charge

• Atoms have electrons that have a positive charge.

Rutherford discover what about the atom when a tiny percent of alpha particles either deflected or bounced off of the gold foil?

• The atom is mostly empty space

• The atom has a positive, solid core called a nucleus

• Atoms have electrons that have a negative charge

• Atoms have electrons that have a positive charge.

JJThomson proved what wrong about Democritis theory when he discovered a negative particle within the atom?

• He proved that the atom can be divided (not indivisible)

• He proved tha the atom should not be called the atomos

• He proved that democritis has no evidence to back up his findings.

• He proved that Rutherford would agree with him about the atom being neutral.

The only part of Democritis theory we kept until today is which of the following.

• The atom is indivisible

• The atom' s name comes from "atomos"

• All atoms are made up of the same material.

• All atoms are made up of different material.

Which scientist had no scientific data to back up his atomic theory- he did not experiments.

• JJ Thomson

• Rutherford

• Dalton

• Democritis

Dalton also discover what about the atom after doing many chemical reactions.

• The atom is mostly empty space

• The atom has a positive, solid core called a nucleus

• Atoms always react in whole number ratios.

• Atoms have electrons that have a positive charge.

What is the final Quantum mechanical model based on from all the atomic theories.

• Only based on Rutherford and Thomson's theories.

• It is a combination of all the scientist's atomic theories over the past 1000 years, but mostly based on Rutherford's positive nucleus and Schrodinger's and Heisenberg's electron cloud.

• Only basedon Heisenberg/Schrodinerg electron cloud and Thomson's theories.

• It is a combination of Democritis, Dalton and Rutherford only.

Which subatomic particle has no charge, is found in the nucleus, and contributes to the overall mass of an atom?

• proton

• electron

• neutron

• scantron

How many electrons would a neutral atom of Argon (Ar) have?

• 18

• 22

• 39

• 40