Chemistry semester 1 review

Front

What are valence electrons?

Back

The electrons in the outermost energy level.

Front

In a neutral atom, what is true about protons and electrons?

Back

The number of protons and the number of electrons are equal.

Front

What does the Bohr model represent?

Back

A simplified representation of an atom, showing electrons in energy levels around the nucleus.

Front

Why do atoms get bigger as you move down the periodic table?

Back

Because the atoms have more energy levels.

Front

What are the rows on the Periodic Table of Elements called?

Back

Periods.

Front

What are the columns on the Periodic Table of Elements called?

Back

Groups or families.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number?

Back

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

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond is formed by the transfer of electrons, while a covalent bond is formed by the sharing of electrons.