The History of the Atom

Question 1

In Thompson's plum-pudding model, the plums represent...

Accepted Answer

electrons

Question 2

What is the arrow pointing at?

Accepted Answer

neutron

Question 3

An isotope of Boron, Boron-12, has 5 protons. How many protons does the isotope Boron-15 have?

Accepted Answer

5

Question 4

What was the negatively charged particle discovered by Thompson

Accepted Answer

electron

Question 5

What is the central region of the atom?

Accepted Answer

nucleus

Question 6

Where are electrons likely to be found?

Accepted Answer

in the electron cloud

Question 7

The smallest particle into which an element can be divided and still be the same substance is..

Accepted Answer

atom

Question 8

The raised surfaces of this atom show...

Accepted Answer

electrons

Question 9

What did Democritus, Dalton, Thompson, Rutherford, and Bohr all have in common?

Accepted Answer

They all contributed to the development of the atomic theory

Question 10

What is the subatomic particle in the center of an atom that has no charge?

Accepted Answer

neutron

Question 11

What is the arrow pointing at?

Accepted Answer

nucleus

Question 12

What is an atom that has the same number of protons but different number of neutrons?

Accepted Answer

an isotope

Question 13

Who proposed this model of the atom?

Accepted Answer

Thompson

Question 14

Which has the least mass?

Accepted Answer

electrons

Question 15

What is the unit of mass that describes the mass of an atom or molecule?

Accepted Answer

atomic mass unit (amu)

Question 16

How do we know the number of protons in the nucleus of an atom?

Accepted Answer

atomic number

Question 17

What is the subatomic particle that has a positive charge?

Accepted Answer

proton

Question 18

"Cannot be divided"

Accepted Answer

atom

Question 19

What is the sum of protons and neutrons in an atom?

Accepted Answer

mass number

Question 20

What is the arrow pointing at?

Accepted Answer

proton

Question 21

What is the arrow pointing at?

Accepted Answer

electron

Question 22

An atom of Silver with 47 protons, 47 electrons, and 61 neutrons would have a mass number of..

Accepted Answer

108

Questions 22