Atomic Theory

Question 1

The sum of the number of protons and neutrons in the nucleus are

Answer 1

Mass number

Question 2

All atoms of the same element have the same (protons)

Answer 2

Atomic Number

Question 3

Dense, positively-charged center of an atom is called

Answer 3

Nucleus

Question 4

Scientist who discovered the electron using cathode ray tube experiments

Answer 4

Thomas

Question 5

Negatively-charged subatomic particle that has negligible mass found outside the nucleus is called?

Answer 5

Electron

Question 6

Positively charged subatomic particle that has mass of 1 amu resides in the nucleus

Answer 6

Proton

Question 7

Atoms of the same element having the same number of protons, but different numbers of neutrons are called

Answer 7

Isotopes

Question 8

Subatomic particle with a relative mass of 1 amu resides in the nucleus neutrally charged

Answer 8

Neutron

Question 9

Conclusion of Rutherford’s experiments in which gold foil was bombarded with alpha particles

Answer 9

Atoms contain negatively charged particles called electrons

Question 10

Greek philosopher who proposed a limit to the smallest particles of a substance; called atomos

Answer 10

Democritus

Question 11

All of the following ideas from John Dalton are supported expect:

Answer 11

All matter is indivisible and indestructible.