Lesson 1: Atomic Number and Atomic Mass

Question 1

The basic unit that makes up all matter

Answer 1

Atom

Question 2

True or False: Atoms have their own name, atomic mass, and atomic size.

Answer 2

True

Question 3

What do we call these different atoms?

Answer 3

Chemical Elements

Question 4

Where are chemical elements organized?

Answer 4

In the periodic table

Question 5

True or False: Matter is made up of destructible atoms.

Answer 5

False, indestructible.

Question 6

True or False: Atoms forming molecules combine in large whole-numbered ratios.

Answer 6

False, small whole-numbered ratios.

Question 7

True or False: Atoms creating molecules combine in small half-numbered ratios.

Answer 7

False, small whole-numbered ratios.

Question 8

True or False: Atoms of a given element have identical properties.

Answer 8

True

Question 9

True or False: Atoms forming molecules combine in small whole-numbered ratios.

Answer 9

True

Question 10

True or False: A molecule is the smallest particle of an element.

Answer 10

False, atom

Question 11

True or False: Atoms cannot be created only.

Answer 11

False, also destroyed

Question 12

True or False: Atoms cannot be destroyed only.

Answer 12

False, also created

Question 13

True or False: Atoms cannot be created nor destroyed.

Answer 13

True

Question 14

True or False: Atoms change in chemical reactions.

Answer 14

False, remain unchanged

Question 15

True or False: Atoms remain unchanged in chemical reactions.

Answer 15

True

Question 16

Dalton’s Atomic Theory

Answer 16

1. Matter is made up of indestructible atoms.
2. The smallest particle of an element is the atom.
3. Atoms of a given element have identical properties.
4. Atoms cannot be created nor destroyed. They remain unchanged in a chemical reaction.
5. Atoms forming molecules combine in small whole-numbered ratios.

Question 17

Refers to the columns on the periodic table

Answer 17

Group

Question 18

Refers to the rows on the periodic table

Answer 18

Period

Question 19

True or False: Elements in a group have the same number of electron shells.

Answer 19

False, valence electrons

Question 20

True or False: Elements in a period have the same number of electron shells.

Answer 20

True

Question 21

True or False: Elements in a group have the same number of valence electrons.

Answer 21

True

Question 22

True or False: Elements in a row have the same number of valence electrons.

Answer 22

False, electron shells

Question 23

How many periods in the periodic table?

Answer 23

7

Question 24

How many groups in the periodic table?

Answer 24

18

Question 25

True or False: An electron has no charge.

Answer 25

False, charge of -1

Question 26

True or False: The charge of a proton is -1.

Answer 26

False, +1

Question 27

True or False: The charge of an electron is -1.

Answer 27

True

Question 28

True or False: The charge of a proton is +1.

Answer 28

True

Question 29

True or False: The charge of a neutron is also -1.

Answer 29

False, 0

Question 30

True or False: The charge of a proton is 0.

Answer 30

False, +1

Question 31

What is the mass of a proton?

Answer 31

1.0073 amu

Question 32

What is the mass of a neutron?

Answer 32

1.0087 amu

Question 33

What is the mass of an electron?

Answer 33

0.00055 amu

Question 34

Who discovered the electron?

Answer 34

John Joseph ( J.J.) Thomson

Question 35

Who discovered the neutron?

Answer 35

James Chadwick

Question 36

Who discovered the proton?

Answer 36

Ernest Rutherford

Question 37

True or False: It was Ernest Rutherford who discovered the electron.

Answer 37

False, J.J. Thomson

Question 38

True or False: James Chadwick discovered the proton.

Answer 38

False, Ernest Rutherford

Question 39

True or False: J.J. Thomson discovered the neutron.

Answer 39

False, James Chadwick

Question 40

When was the proton discovered?

Answer 40

1900s

Question 41

When was the electron discovered?

Answer 41

1897

Question 42

When was the neutron discovered?

Answer 42

1932

Question 43

True or False: Neutrons were the first to be discovered.

Answer 43

False, electrons

Question 44

What do we call protons, neutrons, and electrons?

Answer 44

Sub-atomic particles

Question 45

How do we get the number of neutrons?

Answer 45

By subtracting the mass number and atomic number

Question 46

How do we get the mass number?

Answer 46

Add the number of protons and neutrons

Question 47

True or False: Number of protons = Number of neutrons

Answer 47

False

Question 48

True or False: Number of protons = Number of electrons

Answer 48

True

Question 49

True or False: The atomic number is an element’s identifier.

Answer 49

True

Question 50

The total number of neutrons and protons present in the atom’s nucleus

Answer 50

Atomic Mass

Question 51

How many known elements does the modern periodic table have?

Answer 51

118

Question 52

What is located at the center of an atom?

Answer 52

The nucleus