S1.2 The nuclear atom SL

Question 1

Atomic number

Answer 1

The number of protons in the nucleus of an atom.

Question 2

Nucleon number

Answer 2

The number of protons and neutrons in the nucleus of an atom

Question 3

Nuclear symbol notation

Answer 3

The symbol for an atom or ion that shows the mass, number (A), atomic number (Z) and the charge (if any).

Question 4

Mass number

Answer 4

The number of protons plus the number of neutrons in the nucleus of an atom.

Question 5

When are positive ions formed?

Answer 5

When atoms lose electrons

Question 6

When are Negative ions formed?

Answer 6

When atoms gain electrons

Question 7

What is the first step in calculating the average atomic mass of an element from its isotopes?

Answer 7

Multiply the mass number of each isotope by its percent abundance.

Question 8

What do you do after multiplying each isotope’s mass number by its percent abundance to calculate the average atomic mass?

Answer 8

Add these values together.

Question 9

How do you finalize the calculation of an element’s average atomic mass from its isotopic composition?

Answer 9

Divide the total from the previous step by 100 to account for the percent abundance.

Question 10

What does the calculated average atomic mass of an element reflect?

Answer 10

It reflects the weighted average of the isotopes, indicating their contributions to the overall atomic mass based on their natural abundance.