Question

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

Answer 1

Answer:

3d

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.

Answer 2

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.