Unit 2 Test REVIEW

Front

What is the atomic number of lithium?

Back

3

Front

How many protons are in a lithium atom?

Back

3

Front

What is the mass number of the most common isotope of lithium?

Back

7

Front

What is the electron configuration of lithium?

Back

1s² 2s¹

Front

What is the definition of an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the significance of the periodic table's periods?

Back

They represent the energy levels of electrons.

Front

What is the maximum number of electrons in the first shell?

Back

2

Front

What happens to an atom's energy when it absorbs a photon?

Back

It moves to an excited state.

Front

What is the relationship between energy levels and electron shells?

Back

Higher energy levels correspond to higher electron shells.

Front

What is the definition of ground state in an atom?

Back

The lowest energy state of an atom.