Unit 4 Study Guide Concepts 1 & 2

Elements form compounds to be ______.

How many electrons do elements need to be stable?

What elements do not form compounds?

• Halogens
• Alkali metals
• Transition metals
• Noble gases

CaCl₂

Ca- ​ (a)  

Cl-​ (b)  

• 1
• 2
• 0
• 3
• 4

Tags

NGSS.MS-PS1-1

Na₂SO₄

Na- ​ (a)  

S-​ (b)  

O- ​ (c)  

• 1
• 2
• 0
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

Al₂(SO₄)₃

Al- ​ (a)  

S-​ (b)  

O- ​ (c)  

SO- ​ (d)  

• 1
• 2
• 0
• 3
• 12
• 5

Tags

NGSS.MS-PS1-1

CCl₄

C- ​ (a)  

Cl-​ (b)  

• 1
• 2
• 4
• 5

Tags

NGSS.MS-PS1-1

Metals will ​ (a)   electrons to form a ​ (b)   ion.

• lose
• positive
• gain
• negative

Non-Metals will ​ (a)   electrons to form a ​ (b)   ion.

• lose
• positive
• gain
• negative

Cations are ions with a _________ charge.

• positive

• negative