Exit Ticket - Counting Protons, Neutrons, and Electrons

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 determine the number of neutrons in an atom?

Back

To find the number of neutrons, subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons).

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 many protons are in a neutral atom of Sodium-23?

Back

11 protons.

Front

How many electrons are in a neutral atom of Aluminum-28?

Back

13 electrons.

Front

If Arsenic has 43 neutrons, what is its mass number?

Back

76 (33 protons + 43 neutrons).

Front

How many neutrons are in a neutral atom of Phosphorus-30?

Back

15 neutrons.

Front

How many neutrons are in a neutral atom of Magnesium-26?

Back

14 neutrons.

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

What is the significance of the atomic mass unit (amu)?

Back

The atomic mass unit is a standard unit of mass that quantifies mass on an atomic or molecular scale, where 1 amu is defined as one twelfth of the mass of a carbon-12 atom.