Determining Protons Electrons Neutrons

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 many protons are in a gold atom?

Back

79

Front

What does the atomic mass represent?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

How many neutrons are in a gold atom?

Back

118

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 do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.

Front

What is the atomic mass of Beryllium?

Back

The atomic mass of Beryllium is approximately 9.012.

Front

How many electrons does an atom of Krypton have?

Back

36

Front

What is the significance of the bottom number in an element's box on the periodic table?

Back

The bottom number typically represents the atomic mass of the element.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.