Physical Science Midterm

Front

How many valence electrons does a group 2 element have?

Back

2

Front

What is the correct way to determine an element’s average atomic mass?

Back

It is determined by counting the number protons + neutrons.

Front

What are the horizontal rows of elements in the periodic table called?

Back

Periods

Front

What should you do if you do not understand a direction or part of a laboratory procedure?

Back

Ask the teacher before proceeding.

Front

Which of the following is not a sign of a chemical change?

Back

Melting.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that determine its chemical properties.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition, while a chemical change does.

Front

What is the significance of the periodic table?

Back

It organizes elements based on their atomic number and properties.