Homework Practice

Printable assignment

Electron Shells and Valency: Predict the Combining Power

Section A: Electronic Configuration

Question 1mcq

Maximum electrons in K shell are:

A.18

B.8

C.32

D.2

Question 2mcq

Maximum electrons in L shell are:

A.2

B.8

C.18

D.1

Question 3mcq

Electronic configuration of oxygen

(Z=8)

is:

A.8

B.2,8

C.2,6

D.2,4

Question 4mcq

Electronic configuration of sodium

(Z=11)

is:

A.8,3

B.2,9

C.2,8,1

D.2,7,2

Question 5mcq

Electronic configuration of argon

(Z=18)

is:

A.18

B.2,6,10

C.2,8,8

D.2,8,7

Question 6mcq

The rule

2n^2

gives maximum electron capacity of shell number

n

. For

n=2

, capacity is:

A.8

B.2

C.4

D.18

Section B: Valence Electrons and Valency

Question 7mcq

Electrons in the outermost shell are called:

A.Neutrons

B.Nucleons

C.Valence electrons

D.Isotopes

Question 8mcq

An element with configuration 2,8,1 usually has valency:

A.7

B.1

C.8

D.0

Question 9mcq

An element with configuration 2,6 usually has valency:

A.8

B.0

C.2

D.6

Question 10mcq

A noble gas usually has valency:

A.1

B.2

C.7

D.0

Question 11mcq

An element with 7 valence electrons generally needs:

A.1 electron to complete octet

B.No electrons ever

C.8 protons

D.7 more electrons

Question 12mcq

Which element is chemically most stable?

A.Oxygen

(2,6)

B.Sodium

(2,8,1)

C.Neon

(2,8)

D.Chlorine

(2,8,7)