8th Grade Science - Unit 3 Study Guide

What are the two main components of an atom's nucleus?

• protons & neutrons

• protons & electrons

• neutrons & electrons

Organization of atoms. Drag the answers to the correct category.

Groups:

(a) Electron Locations

,

(b) Proton Charge

,

(c) Neutron Charge

,

(d) Electron Charge

• neutral

• energy levels

• electron shells

• negative (-)

• electron cloud

• positive (+)

Tags

NGSS.MS-PS1-1

Tells the number of protons OR electrons of an element.

• atomic mass

• atomic number

• group

• period

Horizontal row that tells you how many electron shells.

• atomic mass

• atomic number

• group

• period

Vertical columns that tell how many valence electrons.

• atomic mass

• atomic number

• group

• period

Balanced equations show the​ (a)   . This means ​ (b)   cannot be created or destroyed.

• Law of Conservation of Matter
• matter
• electrons
• Bohr Model
• mixture
• Lewis Dot Diagram
• protons

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• 4
• 3
• 2
• 5
• 1

Tags

NGSS.MS-PS1-5

• 1
• 5
• 4
• 2
• 3

Tags

NGSS.MS-PS1-5

Match the definition with the correct terms and examples.

Groups:

(a) homogeneous

,

(b) heterogeneuos

• dissolve sugar in water

• same throughout

• different throughout

• salad

Which is NOT an example of a pure substance?

• gold (Au)

• oxygen gas

• one type of element/atom

• multiple types of elements/atoms