Question

Titanium atoms have electrons in 1s, 2s, 2p, 3 s, 3p, 4s and 3d orbitals. Which of the following has the orbitals listed in the order of decreasing screening ability?

Select one:

a. 1s, 2p, 2s, 3p

b. 2s, 2p, 3d, 3s

c. 2s, 2p, 3s, 3d

d. 1s, 2s, 3p, 3s

e. none of these

please explain this concept i am not sure if i have the answer right.....thank you

Answer 1

the information required is

for the same shell value (n) the penetrating power of an electron follows this trend in subshells:

s>p>d>f

And

for different values of shell (n) and subshell (l), penetrating power of an electron follows this trend:

1s>2s>2p>3s>3p>4s>3d>4p>5s>4d>5p>6s>4f

given

1s 2s 2p 3s 3p 4s 3d

so

the order should be

1s > 2s > 2p > 3s > 3p > 4s > 3d

a) 1s > 2p > 2s > 3p

this is wrong because

the correct order is

2s > 2p

b) 2s> 2p > 3d > 3s

this is also wrong

because

3s should be greater than 3d

c) 2s >2p > 3s > 3d

this is correct

d) 1s > 2s > 3p > 3s

this is wrong

because

3s should be greater than 3p

so

finally

the answer is

c) 2s , 2p , 3s ,3d