Question

two elements X and Y electronic configuration is X (2881) and Y (2,1). Which element is more reactive give explanation for it.​

Answer 1

Answer:

X

Explanation:

X has the configuration 2,8,8,1 So, it is 1s2 2s2 2p6 3s2 3p6 4s1

Y has the configuration 2,1. It means- 1s2 2s1

The outer shell quantum number of X is 4 and for Y it is 2

Between the two elements, the one that loose electron easily, will be more reactive. As the last electron of X is at a greater distance than the last electron of Y, the nuclear attraction force on the 4s electron is less than 2s. So, X will lose an electron more readily and get the noble gas electronic configuration 1s2 2s2 2p6 3s2 3p6 .