Question

In which period is an element that has the electron configuration 152 252

2p6 352 3p6 3d10 452 4p1 ? *

Period 4
Period 1
Period 2
Period 3​

Answer 1

Period 4

Step-by-step explanation:

Given the electronic configuration of the element;

= Is² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹

The period of the element is determined by the highest coefficient in the electronic configuration.

For this given configuration (Is² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹), "4" is the highest coefficient and the element will certainly belong to period 4 in the periodic table.

To test if the prediction is correct:

Total number of electrons in the given element = 2+2+6+2+6+10+2+1 = 31

The element with atomic number of 31 = Gallium (Ga). (This element belong to period 4).