Question

Which set of these comparisons is incorrect? (more stable means it has a more negative energy.)

a.the 1s orbital in h is more stable than the 1s orbital in he+

b.the 2s orbital in he atom is less stable than the 2s orbital in he+

c.the 2s subshell in li is more stable than the 2p subshell in li?

Answer 1

Answer:

• The option B are incorrect
• The options A and  C are correct.

Explanation:

Option A :

• The I s orbital of H is stable than Is orbital of He+
• Because, neutral elements are more stable than charge elements.

Option B:

• As in the electronic configuration, the electrons are present in 1s orbitals either in case of He or He +.
• So there there is no possibilities of 2s orbitals in both cases.

Option C:

• The 2s orbital of Li is more stable than 2p because
• s orbital have only 2 electrons while p-subshel has 6 electron.
• The half filled or completely filled orbitals are more stable. So s sub-shell is half filled so it become more stable.

Answer 2

Answer:

b.The 2s orbital in He atom is less stable than 2s orbital in He+.

Explanation:

We have to find incorrect comparison

1.The 1 s orbital  in H is more stable than the 1 s orbital in He+

We know that

Atomic number of H=1

Atomic number of He+=1

Configuration of H=$1s^1$

Configuration of He+=$1s^1$

We know that neutral atom is more stable than charged atom.

He atom have two electron before losing one electron but after losing 1 electron it becomes positive ion.

Both have half filled configuration but helium atom attained this configuration after losing on electron.

So, it highly reactive to fill their outer shell.

Therefore, it is less stable.

Therefore, the 1 s orbital of H is more stable than the 1 s orbital of He+.

b.The 2s orbital in He atom is le.ss stable than 2s orbital in He+.

Configuration He=$1s^2$

Configuration of He+=$1s^1$

We know that fully filled or half filled configuration are stable configuration.

Configuration of He is full filled because s orbital can have maximum two electron .

But both cannot have 2 s orbital .

If atom have no 2s orbital then we can not compare stability of 2s orbital  of  He and He+.

So , it is false.

C.The 2s sub-shell in Li is more stable than the 2p sub-shell in Li.

Atomic number of Li=3

Configuration of Li=$1s^2 2s^1$

We know that s orbital can have maximum 2 electron and p orbital can have maximum 6 electrons.

Half filled or fully filled configuration is more stable configuration .

2s orbital of Li is half filled .Therefore, it is more stable.

Hence, it is true.

Answer:b.The 2s orbital in He atom is less stable than 2s orbital in He+.