Atomic Number and Mass Number

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass number?

Back

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

Front

How do you calculate the mass number?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is the atomic number of Magnesium?

Back

The atomic number of Magnesium is 12.

Front

What is the atomic number of Fluorine?

Back

The atomic number of Fluorine is 9.

Front

If an atom has 3 protons, what is its atomic number?

Back

The atomic number is 3.

Front

If an atom has a mass number of 24 and 12 protons, how many neutrons does it have?

Back

Number of neutrons = Mass number - Number of protons = 24 - 12 = 12.

Front

What does an atomic number of 1 represent?

Back

An atomic number of 1 represents Hydrogen.

Front

What is the relationship between atomic number and element identity?

Back

The atomic number determines the identity of an element; each element has a unique atomic number.

Front

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

Back

The mass number is 14.