Atomic Number and Atomic Mass

Front

What is the atomic number of an element?

Back

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

Front

How do you find the atomic mass of an atom?

Back

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

Front

What is the mass number of an atom?

Back

The mass number is the sum of protons and neutrons in the nucleus.

Front

If an atom has 10 protons, what is its atomic number?

Back

10

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

How many neutrons are in an atom with a mass number of 12 and an atomic number of 6?

Back

6 neutrons (Mass number - Atomic number = Neutrons: 12 - 6 = 6).

Front

What is the atomic number of carbon?

Back

6

Front

What is the mass number of an oxygen atom with 8 protons and 8 neutrons?

Back

16 (8 protons + 8 neutrons = 16).

Front

What does the atomic number tell you about an element?

Back

It tells you the number of protons and identifies the element.

Front

If an atom has 15 protons and 18 neutrons, what is its mass number?

Back

33 (15 protons + 18 neutrons = 33).