Question

Im having trouble knowing which configuration answer applies to each of these statements.

Select the electronic configuration that best fits the statement.

1s2 2s22p5 3s23p5

1s2 2s22p6 3s23p63d3 4s2

1s2 2s22p62d10 3s23p6

1s2 2s22p6 3s23p6

Answers:

1. The ground-state configuration for an atom of a transition element

2. An unreactive atom

3. An impossible electronic configuration

4.Excited state of an atom

Answer 1

a)

1s2 2s22p5 3s23p5

Here 2p orbital is not completely filled and electron in higher orbitals are getting filled.

So, this is Excited state of an atom

Answer: 4

b)

1s2 2s22p6 3s23p63d3 4s2

d orbital is still getting filled. So, elements must belong to d block. This is transition element

Answer: 1

c)

1s2 2s22p62d10 3s23p6

For n=2, possible values for orbitals are s and p.

2d orbital is not possible

Answer: 3

D)

1s2 2s22p6 3s23p6

Here all p orbitals are filled and it has noble gas configuration.

So, it is un reactive element

Answer: 4