2.3 Atomic Structure and Quantitative Chemistry

Question 1

The atomic number is the smaller of the two numbers in the periodic table. True or false?

Answer 1

True

Question 2

The mass number is the larger of the two numbers in the periodic table. True or false?

Answer 2

True

Question 3

The mass of a proton

Answer 3

1

Question 4

The charge of a proton

Answer 4

+1

Question 5

The mass of a neutron

Answer 5

1

Question 6

The charge of a neutron

Answer 6

0

Question 7

The mass of an electron

Answer 7

1/1836 or almost 0

Question 8

The charge of an electron

Answer 8

-1

Question 9

The atomic number is equal to

Answer 9

the number of protons in an atom

Question 10

The number of protons in an atom is equal to

Answer 10

the number of electrons in an atom

Question 11

The number of neutrons is equal to

Answer 11

the mass number - the atomic number

Question 12

An isotope of an element has

Answer 12

the same number of protons and electrons but different numbers of neutrons.

Question 13

The relative atomic mass of an atom is the average mass of an atom relative to which element?

Answer 13

Carbon-12

Question 14

Chlorine has a mass of 35.5 which isotope chlorine-35 or chlorine-37 is more abundant?

Answer 14

Chlorine 35. 75% is chlorine 35 and 25% is chlorine 37.

Question 15

The relative molecular mass of a compound is

Answer 15

the sum of the relative atomic masses of the elements in that compound.