8.1 Mastery Check

Categorize the following elements into whether they form cations or anions.

Groups:

(a) Cations

,

(b) Anions

• Beryllium

• Phosphorous

• Oxygen

• Aluminum

• Sodium

• Lithium

• Fluorine

How many valence electrons do all elements (except hydrogen and helium) need to become stable?

• 8
• 10
• 4
• 6

Phosphorous needs to ​ (a)   ​ ​ (b)   valence electrons to go with the ​ (c)   it already has.

• gain
• 3
• 5
• lose
• 8

Select the correct number of atoms of each element in Na₂SO₄

• 2 sodium

• 4 sulfur

• 1 sulfur

• 4 oxygen

• 4 sodium

Tags

NGSS.MS-PS1-1

In (NH₄)₃PO₄, there are ​ (a)   nitrogen, ​ (b)   hydrogen, ​ (c)   phosphorus, and ​ (d)   oxygen atoms.

• 3
• 12
• 1
• 4
• 0
• 7

Tags

NGSS.MS-PS1-1

Based on your practice page 10, what is the correct chemical formula for calcium and oxygen?

• CaO
• CaO₂

• Ca₂O

• C₂O

Tags

NGSS.MS-PS1-1

Based on your practice page 10, what is the correct chemical formula for aluminum and chlorine?

• AlCl₃

• AlCl
• Al₂Cl₆

• AlCl₂

Tags

NGSS.MS-PS1-1

This could be the dot diagram of

• Mg

• Cl

• C

• O

Tags

NGSS.MS-PS1-1

What is the goal of the Lewis Dot Structure?

• To determine the electron position.

• To show the element's valence electrons & bonding capabilities.

• To find the atomic mass of an element.

• To search for the number of electrons in an individual atom.

Tags

NGSS.HS-PS1-2

How would you draw a Lewis dot diagram for Magnesium?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1