15. Mass number

What is the mass number of an atom?

Total number of protons and neutrons in the nucleus.

What symbol represents the mass number?

A

How do you calculate the mass number?

Mass Number (A)=Number of Protons (Z)+Number of Neutrons (N)

How do you find the number of neutrons?

Number of Neutrons (N)=Mass Number (A)−Number of Protons (Z)

What is the mass number of Carbon-12?

12

How many protons and neutrons does Carbon-12 have?

6 protons and 6 neutrons.

What is the mass number of Oxygen-16?

16

How many protons and neutrons does Oxygen-16 have?

8 protons and 8 neutrons.

What are isotopes?

Atoms of the same element with different mass numbers due to different numbers of neutrons.

How is the mass number used in nuclear reactions?

It is conserved; total mass number of reactants equals the total mass number of products.

What is the notation for Carbon-12?

C^12

How does the mass number differ from the atomic number?

Atomic Number (Z) is the number of protons; Mass Number (A) is the total number of protons and neutrons.