Chemistry Midterm December 2024

Front

What are valence electrons?

Back

Valence electrons are the electrons located in the outermost energy level (or orbit) of an atom, which are involved in chemical bonding.

Front

What are the three subatomic particles of an atom?

Back

The three subatomic particles of an atom are protons, neutrons, and electrons.

Front

What defines an element?

Back

An element is defined as a pure substance that consists of only one type of atom.

Front

Which of the following is an example of an element?

Back

Oxygen is an example of an element.

Front

What do blue spheres represent in a model of nitrogen?

Back

In a model of nitrogen, the blue spheres represent electrons.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

How do you determine the atomic number of an element?

Back

The atomic number of an element is determined by the number of protons in its nucleus.