Covalent Bonding Review

How many valence electrons does Nitrogen (N) have?

• 1

• 3

• 5

• 7

Answer explanation

Nitrogen is located in group 5A (aka group 15 on the periodic tables we use in class) so it has 5 valence electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What can be generalized about covalent bonds? Electrons are___

• Transfered

• Shared

• Destroyed

• Exchanged

Answer explanation

Covalent bonds form when electrons (bonding pairs) are shared between elements so they both fulfill the octet rule

What type of bond or bonds form when 3 pairs of electrons are shared?

• Single Double Combo Bond

• 3 Single Bonds

• Tribond

• Triple Bond

Answer explanation

Each bonding pair (pair of electrons being shared) denotes 1 bond. If 3 pairs are being shared between 2 atoms 3 bonds form becoming a triple bond.

Which of the following best represents a Fluorine molecule?

• A

• B

• C

• D

Answer explanation

When 2 Fluorine atoms come together they share a single pair of electrons forming a single bond between them. The lone pairs fluorine started with still have to be shown to denote a full octet

Tags

NGSS.HS-PS1-1

Carbon is in 4A, how many bonds can it form based on electrons needed to fill its outer shell?

• 1

• 3

• 5

• 4

Answer explanation

HONC

1 2 3 4

Carbon has 4 valence electrons and will form up to 4 bonds to fill its octet

Tags

NGSS.HS-PS1-1

What is a diatomic element?

• A metal bonded with a nonmetal

• 2 or more nonmetals bonded together

• 2 or more metals bonded together

• 2 atoms of the same elements bonded together

Answer explanation

Many elements are stable in a diatomic form. Di- is the prefix for 2 and the word atom tells you it is 2 units of the same element

How many electrons are shared in a double bond?

• 2

• 4

• 8

• 20

Answer explanation

Each bonding pair (set of 2) of electrons denotes a bond. 2 pairs becomes a double bond. 2 sets of 2 electrons = 4 e-

What type of bond is formed between a metal and a nonmetal?

• Covalent

• Ionic

• Hydrogen

• Friendly

Tags

NGSS.HS-PS1-1

What 2 types of atoms form a covalent bond

• 2 nonmetals

• 1 nonmetal and 1 metal

• 2 metals

• 2 noble gases

Answer explanation

A covalent bond is formed between two nonmetals. Generally nonmetals have similar electronegativities and can not take electrons from one another so they share to fill their octet

Since Covalent compounds do not have free charges, they are ___

• Good conductors

• Poor conductors

• Ionic

• metallic

Answer explanation

Due to the lack of a free charge there are no electrons or ions available to conduct an electrical current