SS Chem Unit 3 Lesson

Unit 3: Atomic Structure

Multiple Choice

What part of the atom is indicated by the red sphere?

• nucleus

• electron cloud

• electrons

• neutrons

Multiple Choice

What best describes the nucleus?

• Located in the center of the atom, holds the atom's mass, and is positively charged.

• Located in the center of the atom, does not hold the atom's mass and is negatively charged

• Located in the center of the atom, holds the atom's mass, and has no charge

• Located in the center of the atom, does not hold the atom's mass, and is positively charged.

Multiple Choice

What best describes a neutron?

• It is located outside of the nucleus and has a negative charge

• It is located inside of the nucleus and has a positive charge

• It is located outside the nucleus and has no charge

• It is located inside the nucleus and has no charge

Multiple Choice

What best describes a proton?

• It is located outside the nucleus and has a positive charge.

• It is located inside the nucleus and has a positive charge.

• It is located inside the nucleus and has no mass

• It is located inside the nucleus and has no charge.

Multiple Choice

What best describes an electron?

• It is located outside of the nucleus and has a negative charge

• It is located outside of the nucleus and has no charge

• It is located inside the nucleus and has a mass

• It is located inside of the nucleus and has no mass

Multiple Choice

Which subatomic particle has a negative charge?

• proton

• neutron

• electron

• all of the above

Multiple Choice

An atom's reactivity is determined by it's what?

• protons

• neutrons

• valence electrons

• mass

Open Ended

What is an Atom?

Multiple Choice

Atoms are composed of smaller particles called what ?

• atoms

• subatomic particles

• positive particles

• nucleus

Multiple Choice

Protons have what type of charge?

• neutral

• negative

• positive

• radioactive

Multiple Choice

Neutrons have what type of charge?

• neutral

• negative

• positive

• radioactive

Multiple Choice

electrons have what type of charge?

• neutral

• negative

• positive

• radioactive

Draw

circle the atomic number and underline the atomic mass

Open Ended

A neutral Atom is have the same number of what?

Open Ended

Atomic mass is ____+ ____

3.2 - Atomic Structure

Please follow along, taking notes and participating in the interactive questions.

Multiple Choice

Three protons have a total charge of _______.

• +3

• 0

• -3

• 2

Multiple Choice

Three neutrons have a total charge of ________.

• +3

• 0

• 2

• -3

Multiple Choice

A nucleus with three protons and three neutrons has a total charge of ________.

• +3

• 0

• -3

• +6

Multiple Choice

How many protons are in a Helium atom? (Hint: same as atomic number!)

• 2

• 8

• 5

• 6

Multiple Choice

How many protons are in an Oxygen atom? (Hint: same as atomic number!)

• 2

• 8

• 5

• 6

Multiple Choice

This is a neutrally-charged lithium ion. It has 3 protons and 3 neutrons. How many electrons does it have?

• 9

• 0

• 6

• 3