8 - Unit 1, Section 1 - Day 1

Atoms and Elements: A Review

Unit 1, Section 1

All atoms are made of the same three subatomic particles. What are they?

Question 1

All atoms are made of:

• Protons

• Neutrons

• Electrons

Answer 1

What are the electric charges of protons, neutrons, and electrons?

Question 2

• Protons - positive

• Neutrons - no charge (neutral)

• Electrons - negative

Answer 2

The atomic number of an atom is the number of _______________ in the nucleus of that atom.

Question 3

The atomic number is the number of protons in the nucleus of the atom.

Answer 3

The mass number of an atom is the number of protons plus the number of ____________ in the nucleus of that atom.

Question 4

The mass number is the number of protons plus the number of neutrons in an atom.

Answer 4

Where are the protons, neutrons, and electrons in an atom?

Question 5

• Protons - in the nucleus

• Neutrons - in the nucleus

• Electrons - orbiting around the nucleus

Answer 5

• Protons and neutrons are approximately the same size

• Electrons are approximately 1,000 times smaller

How Big are Protons, Neutrons, and Electrons?

Complete the exit ticket

I'll give you the Exit Ticket assignment

Work on it on your own

Turn it in before class ends