Question

In the electron configuration for scandium (atomic

number 21), what is the notation for the three highest-
energy electrons?
Select one:
O a. 3d¹ 4s²
O b. 4s³
O c.
3d³
O d. 4s²4p¹

Answer 1

a

Step-by-step explanation:

I'll explain along side with potassium (k) and Calcium (Ca). the unit for scandium is SC

Sc = 21

Ca = 20

K =19

k = 1s²,2s²,2p⁶,3s²,3p⁶,3d⁰,4s¹

Ca = 1s²,2s²,2p⁶,3s²,3p⁶,3d⁰,4s²

Sc = 1s²,2s²,2p⁶,3s²,3p⁶,3d¹,4s²

if you notice above Sc has 3d¹ while Ca has 3d⁰. This is because Sc is a transition metal

Transition metals are metals whose d-orbital aré partially filled with electron