Question

The filling of which orbital is represented by the transition metals in period 4? 3d 3s 2s 2p

Answer 1

transition metals are the metal located in the center block of the periodic table. Also, this block represents the D sublevel.

So, the answer is 3d.

Also, keep in mind that the D block starts "one period late". this means that if you are in period 4, the 3d orbital starts. if you are in period 5, that where 4d starts.

Answer 2

3d

Step-by-step explanation:

Transition metal are elements having partially filled d sub shell. In these metals last electron is filled in d sub shell.

General electronic configuration of transition metal:
`(n-1)^(1-10)ns^(1-2)`

Where, n = outermost shell.

Period 4 means, last shell no. is 4.

For transition metals of period 4,

General electronic configuration:
`3d^(1-10)4s^(1-2)`

for example, Fe belong to periods 4.

Electronic configuration of Fe:
`[Ar]3d^64s^2`

So, filling of 3d orbital is represented by transition metal of 4.