Unit 4: Atomic Theory

Question 1

What is the mass number of this isotope?

Accepted Answer

4

Question 2

Which subatomic particle has the smallest mass?

Accepted Answer

Electrons

Question 3

Which part of Dalton's theory was disproved with the discovery of isotopes?

Accepted Answer

Atoms from the same elements are identical.

Question 4

Why are atoms electrically neutral?

Accepted Answer

Protons and electrons cancel out each other’s charge.

Question 5

A sample of an element that is large enough to measure in lab refers to the

Accepted Answer

macroscopic form

Question 6

What model of the atom is represented in this image?

Accepted Answer

Bohr’s Planetary Model

Question 7

What is true about a wave of light with a low frequency?

Accepted Answer

long wavelength

Question 8

Which scientist is responsible for the discovery of the nucleus?

Accepted Answer

Ernest Rutherford

Question 9

Bohr's atomic theory shows electrons orbiting around the nucleus like planets around the sun.

Accepted Answer

True

Question 10

As an electron moves closer to the nucleus, it is gaining energy.

Accepted Answer

False

Question 11

What is Niels Bohr’s contribution to modern atomic theory?

Accepted Answer

Electrons are found in specific energy levels.

Question 12

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

Accepted Answer

Neutrons + Protons

Question 13

This element contains how many protons?

Accepted Answer

17

Question 14

When atoms absorb energy and electrons move to higher energy levels the enter the

Accepted Answer

excited state

Question 15

The first modern scientist to propose an Atomic Theory...

Accepted Answer

Dalton

Question 16

The type of atoms and their numerical ratio in a compound can be found by...

Accepted Answer

the chemical formula

Question 17

Isotopes are atoms of the same element with different numbers of...

Accepted Answer

neutrons

Question 18

The number of which subatomic particle IDENTIFIES an element?

Accepted Answer

protons

Question 19

This isotope contains how many neutrons?

Accepted Answer

18

Question 20

What did Rutherford conclude about the atom as a result of his Gold Foil experiment?

Accepted Answer

The nucleus is small, dense & positively-charged

Question 21

Experiments with the cathode ray tube resulted in the discovery of...

Accepted Answer

Electrons

Question 22

What model of the atom is represented in this image?

Accepted Answer

Thomson's Plum Pudding Model

Question 23

Which model of the atom was the first to include the nucleus?

Accepted Answer

Rutherford's Nuclear Model

Question 24

Which is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms are composed of protons, neutrons and electrons.

Question 25

The isotope, carbon-14, is written in which notation?

Accepted Answer

hyphen notation

Question 26

Atoms that have an electrical charge due to gain or loss of electrons are called...

Accepted Answer

ions

Unit 4: Atomic Theory

Questions 26

Unit 4: Atomic Theory

Questions 26