Chapter 2

Question 1

Where are the subatomic particles located in the atom?

Answer 1

In the nucleus

Question 2

How does the mass of an electron compare to the mass of a proton?

Answer 2

The mass of an electron is about 2000 times smaller than that of a proton.

Question 3

The subatomic particles that make up all atoms

Answer 3

Proton, electron, neutron

Question 4

The charge and relative mass associated with each particle

Answer 4

Protons —- positive charge
Electrons—negative charge
Neutrons—no charge

Proton and Neutron— relative mass of 1amu each
Electron 1/2000 of an amu and doesn’t contribute significantly to the mass.

Question 5

what units are used for describing the mass of a proton or neutron?

Answer 5

AMU (atomic mass unit)

Question 6

What do the atomic number and mass number indicate?

Answer 6

The atomic number of an atom indicates the number of protons in the atom.
The mass number of an atom is the total number of protons and neutrons present in a given atom of an element.

Question 7

How can you determine the number of protons present in an atom

Answer 7

The atomic number

Question 8

How can you determine the number of neutrons present in an atom

Answer 8

The mass number minus the atomic number

Question 9

How can you determine the number of electrons present in an atom

Answer 9

Is the same number as the number of protons

Question 10

What is the mass number for an oxygen atom(O x/8) that contains 8 neurons?

Answer 10

16

Question 11

Determine the number of protons, neutrons, and electrons for an iodine atom that has a mass number of 131

I: Atomic number 53

Answer 11

P 53
N 78
E 53

Question 12

Determine the number of protons, neutrons, and electrons for a potassium atom that has a mass number of 39. K19

Answer 12

P: 19
N: 20
E: 19

Question 13

Write the symbolic notation for atoms with 5 protons and 6 neutrons

Answer 13

11B
5

Question 14

Write the symbolic notation for atoms with 35 protons and 46 neutrons

Answer 14

81
35Br

Question 15

Write the symbolic notation for atoms with 14 protons and 14 neutrons

Answer 15

28
14Si

Question 16

Write the symbolic notation for atoms with 54 protons and 70 neutrons

Answer 16

124
54 Xe

Question 17

Determine the protons, neutrons, and electrons for 18/8 O

Answer 17

P: 8
N:10
E:8

Question 18

Determine the protons, neutrons, and electrons for 40/20 Ca

Answer 18

P: 20
N:20
E: 20

Question 19

Determine the protons, neutrons, and electrons for 108/47 Ag

Answer 19

P: 47
N : 61
E: 47

Ag Silver

Question 20

Determine the protons, neutrons, and electrons for 207/82 Pb

Answer 20

P 82
N 125
E 82
Pb: Lead

Question 21

Isotopes

Answer 21

Atoms of the same element with different mass number

Question 22

Isotope have the same number of protons(same atomic number), but different

Answer 22

Number of neutrons (therefor different mass number).

Question 23

Copper has two naturally occurring isotopes: copper-63 and copper-65.
Based on the atomic mass from the periodic table which of these is more abundant?

Answer 23

Cu (atomic number 29, 63.55amu)

A: copper-63

Question 24

What is the difference between the mass number for an isotope and the atomic mass of an element?

Answer 24

The mass number is the sum of protons and neutrons for a given isotope.
The atomic mass is the average atomic mass for all the isotopes of an element found in nature.