Unit 6 Test Review

Atoms form bonds by ___​ (a)   _____________________ or _____​ (b)   ___________________ electrons.

• gaining
• losing

Tags

NGSS.HS-PS1-2

Which atom is an exception to the octet rule and is stable with 2 valence electrons when bonded?

• Helium

• Lithium

• Beryllium

• Hydrogen

Determine the number of valence electrons (dot) and charge for Group 16 elements.

• 6, -2

• 4, +2

• 5, -1

• 7, -3

Tags

NGSS.HS-PS1-1

The most electronegative element is _______ and pulls the hardest on the electrons of another atom.

• Fluorine (F)

• Francium (Fr)

• Oxygen (O)

• Nitrogen (N)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In an ionic bond, electrons are ​ (a)   between atoms forming ​ (b)   .

• transferred
• ions
• shared
• molecules

Tags

NGSS.HS-PS1-3

Metals on the ​ (a)   of the periodic table ​ (b)   electrons forming ​ (c)   ions.

• left
• lose
• positive
• right
• gain
• negative

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the ionic compound potassium oxide (K₂O), the overall charge on the formula is

(a)   . The charge on one potassium ion is ​ (b)   and the charge on the oxygen atom is ​ (c)   . Since there are 2 K⁺¹ ions and 1 O^-2 ion in K₂O, (2 x +1) + (-2) = ​ (d)   .

• neutral
• positive
• negative

• +1
• -2
• zero
• one

Tags

NGSS.HS-PS1-3

NGSS.HS-PS1-7

Covalent bonds occur between which types of elements?

• Metal OR non-metal and metal OR non-metal

• Metal and metal

• Non-metal and non-metal

• Metal and noble gas

In a covalent bond, electrons are:

• Transferred between ions

• Shared between atoms

• Lost to form ions

• Gained by atoms

Tags

NGSS.HS-PS1-1

What is the electronegativity difference for a polar covalent bond?

• <0.4

• 0.4 OR >1.7

• 0.4 to 1.7

• >1.7