Chem 1: Atomic Theory + Atomic Structure

Question 1

According to Rutherford, where in the atom are electrons located?

Accepted Answer

in the empty space surrounding the atom

Question 2

Neutrons have a ________ charge and are found _________.

Accepted Answer

neutral, in the nucleus

Question 3

What is the mass number of this element?

Accepted Answer

59

Question 4

The Greek word "atomos" means _______.

Accepted Answer

indivisible

Question 5

The average atomic mass of magnesium is the weighted average of the atomic masses of

Accepted Answer

all of the naturally occurring isotopes of Mg

Question 6

What subatomic particle(s) are located in the nucleus?

Accepted Answer

protons and neutrons

Question 7

Why do atoms have an overall charge of zero?

Accepted Answer

the number of protons equal the number of electrons

Question 8

What are the differences between the isotopes of hydrogen shown below?

Accepted Answer

the mass number and the number of neutrons

Question 9

When an atom of 20 atomic mass units loses an electron, the atom’s mass

Accepted Answer

remains constant

Question 10

Who proposed the nuclear model of the atom?

Accepted Answer

Rutherford

Question 11

Each element is unique and different from other elements because of its

Accepted Answer

number of protons

Question 12

What is the number of neutrons in a neutral atom having 87 electrons and a mass of 223 amu?

Accepted Answer

136

Question 13

Mass number can be calculated by ____.

Accepted Answer

adding protons and neutrons

Question 14

Where is most of the mass in an atom located?

Accepted Answer

in the nucleus

Question 15

What characteristic of an atom is determined by the number of electrons?

Accepted Answer

charge

Question 16

The force that holds the protons and neutrons together in the nucleus is the _____.

Accepted Answer

nuclear force

Question 17

One isotope of oxygen differs from another isotope of oxygen in:

Accepted Answer

the mass

Question 18

Which of the following isotopes represents an atom that has 17 protons and 20 neutrons?

Accepted Answer

37Cl

Question 19

How many electrons are in a neutral sodium atom?

Accepted Answer

11

Question 20

The first person to suggest the idea of atoms was ________.

Accepted Answer

Democritus

Question 21

The number of protons in the atom is the ____.

Accepted Answer

atomic number

Question 22

Who is this well-tested character?

Accepted Answer

Dr. Sheldon Cooper

Question 23

The particles with no charge in an atom are the _______.

Accepted Answer

neutrons

Question 24

What is true of an atom consisting of 2 protons, 2 electrons, and 2 neutrons?

Accepted Answer

all of these are true

Question 25

The particles which have equal but opposite electrical charges are

Accepted Answer

protons and electrons

Question 26

How many protons are in the neutral atom shown below?

Accepted Answer

12

Question 27

What characteristic of an atom is determined by the number of protons?

Accepted Answer

identity

Question 28

How many neutrons are in the atom shown below?

Accepted Answer

26

Question 29

The first atomic theory was proposed by ________.

Accepted Answer

Dalton

Question 30

Carbon-14 is an isotope of carbon (atomic number 6). How many neutrons are in this atom?

Accepted Answer

8

Question 31

How many protons are in Sc+2?

Accepted Answer

21

Question 32

The mass of an electron is _____.

Accepted Answer

almost zero

Question 33

The picture below depicts the cathode-ray tube experiment that led to the discovery of _____.

Accepted Answer

electrons

Question 34

Oxygen’s atomic number is 8. This means that an oxygen atom must always have

Accepted Answer

8 protons

Question 35

Which of the following isotopes of zinc is the lightest?

Accepted Answer

zinc - 64

Question 36

Why were some particles deflected in the experiment shown here?

Accepted Answer

They were repelled by the nucleus.

Question 37

All isotopes of an element have the same ____.

Accepted Answer

number of protons

Question 38

How many neutrons are contained in an iodine nucleus with a mass number of 131?

Accepted Answer

78

Question 39

Which of the following points from Dalton's atomic theory is incorrect?

Accepted Answer

All atoms of the same element are identical.

Question 40

If an element has an atomic number of 7 and an atomic mass of 14, there must be

Accepted Answer

7 protons and 7 neutrons in the nucleus of the element

Question 41

What is between the nucleus and the electrons in an atom?

Accepted Answer

empty space

Question 42

Electrons were discovered by _______.

Accepted Answer

JJ Thomson

Chem 1: Atomic Theory + Atomic Structure

Questions 42

Chem 1: Atomic Theory + Atomic Structure

Questions 42