Atomic Number and Mass Number

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

How is the atomic number defined?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the relationship between mass number and atomic number?

Back

The mass number is the sum of protons and neutrons, while the atomic number is just the number of protons.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the mass number of a Magnesium atom with 12 protons and 12 neutrons?

Back

The mass number is 24 (12 protons + 12 neutrons).

Front

If an atom has 9 protons and 10 neutrons, what is its mass number?

Back

The mass number is 19 (9 protons + 10 neutrons).

Front

What is the atomic number of an atom with 3 protons?

Back

The atomic number is 3.

Front

How many protons does a sodium atom have if its atomic number is 11?

Back

A sodium atom has 11 protons.

Front

What is the mass number of an atom with 7 protons and 7 neutrons?

Back

The mass number is 14 (7 protons + 7 neutrons).

Front

What element has an atomic number of 6?

Back

Carbon has an atomic number of 6.