Atomic Structure / Theory

Question 1

Atomic mass minus atomic number equals the number of

Accepted Answer

neutrons

Question 2

What model of the atom is represented in this image?

Accepted Answer

Plum Pudding Model

Question 3

What two particles make up the nucleus?

Accepted Answer

Protons and neutrons

Question 4

The term “atom” comes from the Greek philosopher named?

Accepted Answer

Democritus

Question 5

What element has the atomic number 7

Accepted Answer

nitrogen

Question 6

The gold foil experiment was conducted by

Accepted Answer

Rutherford

Question 7

Experiments with the cathode ray resulted in the discovery of?

Accepted Answer

Electrons

Question 8

On the periodic table, the atomic mass number equals the number of

Accepted Answer

Protons and Neutrons

Question 9

Who developed the atomic model in which electrons orbit a positively charged nucleus?

Accepted Answer

Rutherford

Question 10

Why are atoms electrically neutral?

Accepted Answer

Protons and electrons cancel out each other’s charge.

Question 11

On the periodic table, the atomic number is equal to the number of

Accepted Answer

Protons

Question 12

Magnesium-25 has ____ protons and ______ neutrons

Accepted Answer

12,13

Question 13

what is the atomic number of gold?

Accepted Answer

79

Question 14

The formula for calculating neutrons in a atom is...

Accepted Answer

atomic mass - atomic number

Question 15

Which scientist is responsible for the discovery of the nucleus?

Accepted Answer

Ernest Rutherford

Question 16

The majority of the mass of an atom comes from which subatomic particle(s)?

Accepted Answer

Neutrons + Protons

Question 17

A subatomic particle with a negative charge is a(n)

Accepted Answer

electron

Question 18

Which of these is not part of Dalton’s atomic theory?

Accepted Answer

Atoms are made of electrons.

Question 19

Which subatomic particle has the smallest mass?

Accepted Answer

Electrons

Question 20

What element has the atomic number 15

Accepted Answer

Phosphorus

Questions 20