Front

What is the atomic number?

Back

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

Front

How many electrons can fit in the first energy level?

Back

2 electrons.

Front

What is the relationship between atomic number and protons?

Back

The atomic number is equal to the number of protons in an atom.

Front

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

Back

Number of neutrons = Mass number - Atomic number.

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

What is the maximum number of electrons in the second energy level?

Back

8 electrons.

Front

What is the significance of the bottom number in a periodic table square?

Back

The bottom number represents the atomic mass of the element.

Front

What is the mass number?

Back

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

Front

How do you find the number of protons in an atom?

Back

The number of protons is equal to the atomic number.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.