tute4

How many valence electrons does hydrogen have?

• 3
• 2
• 5
• 1

Tags

NGSS.HS-PS1-1

What elements generally make a covalent bond?

• metal and nonmetal
• 2 or more nonmetals
• metal
• none of the above

Tags

NGSS.HS-PS1-1

An ionic bond forms when 

• Valence electrons are shared
• a sea of mobile electrons surround the cations
• valence electrons are transferred between atoms
• none of the above

Tags

NGSS.HS-PS1-2

In the chemical formula for an ionic compound, which item is written first?

• positive ion
• negative ion
• subscript
• the female

Tags

NGSS.MS-PS1-1

Magnesium bromide is an ionic compound with the chemical formula MgBr₂.  What does the "2" tell you?

• There are 2 bromide ions for every magnesium ion
• Bromide has a 2- charge
• Bromide has a 2+ charge
• There are 2 magnesium ions to every bromide ion

Tags

NGSS.MS-PS1-1

This type of model shows only the valence electrons of an element? 

• Bohr diagram 
• Childers model
• Lewis-dot diagram 
• What is a valence electron again?

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the name for CaS?

• calcium sulfate
• calcium sulfide
• calcium monosulfide
• monocalcium monosulfide

How many valance electrons does each H, C and O atom have respectively?