skill check-predicting bonds

How many valence electrons do most atoms want to have in order to be stable?

• 3

• 1

• 8

• 4

Calcium is most likely to become a ​ (a)   ion by ​ (b)   ​ electron/s.

• positive
• losing 2
• gaining 2
• 3
• gaining 1
• negative
• losing 1

Answer explanation

elements with 3 or fewer valence electrons are most likely to lose them and become positive ions

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Mg will react with oxygen in the air to form magnesium oxide. Write the formula for the compound that is produced in this reaction.

• MgO

• Mg₂O₃

• MgO₃

• Mg₂O

Answer explanation

O wants to steal 2 electrons to become a stable ion. Mg only has 2 valence electrons, so one Mg atom is provide what one O atom wants.

Tags

NGSS.MS-PS1-1

Ionic bonds are between...

• Metal and Non-metal
• Non-metal and Non-metal
• Metal and Metal

What is the ionic compound that is formed when you combine Li and N?

• LiN

• LiN₃

• Li₃N₂

• Li₃N

Answer explanation

Lithium has 1 valence electron, Nitrogen has 5. So nitrogen must steal 3 total to become stable; this means it must bond with 3 Li atoms.

Tags

NGSS.MS-PS1-1

The formation of a covalent bond relies on the interaction or bonding of...

• 2 Nonmetals

• 1 Nonmetal & 1 Metal

• 2 Metals

• 2 Noble Gases

Which of the following is an ionic bond?

• H₃N

• CaCl₂

• NO₂

• SCl

Answer explanation

It is the only metal to a nonmetal compound

How many covalent bonds can Carbon form?

• 1

• 2

• 3

• 4

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Which two elements are you most likely to form covalent bonds?

Answer explanation

K. Mg, and Ag are metals and do not make covalent bonds. He is a noble gas and does form any stable chemical bonds.

Tags

NGSS.MS-PS1-1