Chemistry Review

Are these molecules also compounds?

• YES
• NO

Tags

NGSS.MS-PS1-1

Are these molecules also compounds?

• YES
• NO

Tags

NGSS.MS-PS1-1

What are the vertical columns on a periodic table called?

• Groups

• Periods

How many protons does a sodium atom have?

• 22.99

• 23

• 11

• 12

How many neutrons does a common sodium atom have?

• 11

• 23

• 12

• 34

Tags

NGSS.MS-PS1-1

How many electrons does a sodium atom have?

• 11

• 12

• 22.99

• 23

Tags

NGSS.MS-PS1-1

How many valence electrons are in the atom shown in the picture?

• 2

• 3

• 5

Tags

NGSS.MS-PS1-1

The electron configuration for sodium is 1s²2s²2p⁶3s¹. How many valence electrons does sodium have?

• 11

• 2

• 6

• 1

Chlorine has 7 valence electrons. What happens when a chlorine atom becomes a chloride ion?

• Chlorine gains an electron and then has a +1 charge

• Chlorine gives away 7 electrons and has a -7 charge

• Chlorine gains an electron and then has a -1 charge

• Chlorine gives away 7 electrons and has a +7 charge

Tags

NGSS.MS-PS1-5

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0