Unit 2 Test REVIEW

Front

What does the Bohr model represent in atomic structure?

Back

The Bohr model represents the arrangement of electrons in an atom, showing energy levels and electron orbits.

Front

What is the correct dot diagram for nitrogen (N) in group 15?

Back

The correct dot diagram for nitrogen shows 5 valence electrons.

Front

What is a compound in chemistry?

Back

A compound is a substance formed when two or more atoms are chemically bonded together.

Front

Which element has the greatest number of energy levels: Thallium (Tl) or Nitrogen (N)?

Back

Thallium (Tl) has the greatest number of energy levels.

Front

What is the electron configuration of an oxygen atom?

Back

The electron configuration of an oxygen atom is 1s² 2s² 2p⁴.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons determine how an atom can bond with other atoms and are crucial for the formation of compounds.

Front

How do you determine the number of energy levels in an atom?

Back

The number of energy levels in an atom corresponds to the period number in the periodic table.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is the role of the nucleus in an atom?

Back

The nucleus contains protons and neutrons and is the center of the atom, contributing to its mass and stability.

Front

How do you identify the group number of an element in the periodic table?

Back

The group number indicates the number of valence electrons in the outer shell of the element.