Periodic Table and Istopes Review

Question 1

If an atom is neutral, the atomic number is also the number of what subatomic particle?

Accepted Answer

electrons

Question 2

Using your Periodic Table, what is the name of the element with the chemical symbol S?

Accepted Answer

sulfur

Question 3

Calculate the number of neutrons if the atomic mass is 45 and the atomic number is 20.

Accepted Answer

25

Question 4

What is the percentage of a particular isotope that occurs in nature called?

Accepted Answer

relative abundance

Question 5

The atomic mass is the number of what subatomic particles?

Accepted Answer

protons and neutrons

Question 6

The atomic number of an element is the number of what subatomic particles?

Accepted Answer

protons

Question 7

Find relative abundance given: C-12 is 99.7% and C-13 is 0.3%.

Accepted Answer

12.003

Question 8

Using your Periodic Table, what is the name of the element with the chemical symbol Cl?

Accepted Answer

chlorine

Question 9

Using your Periodic Table, find the atomic number of oxygen (O)?

Accepted Answer

8

Question 10

Change 65.7% from a percent to a decimal.

Accepted Answer

.657

Question 11

Using your Periodic Table, find the atomic mass of helium (He).

Accepted Answer

4.00260

Question 12

Change .78% from a percent to a decimal.

Accepted Answer

.0078

Question 13

Calculate number of protons if the atomic mass of an element is 34 and the atomic number is 15.

Accepted Answer

15

Questions 13