What is the value of screening constant for outermost electron in Be? (Nearest integer)Single-digit integer (-9 to 9)1234567890-.PreviousClearMark for Review & NextNextInstructionsEnglishNot VisitedNot AnsweredAnsweredMarked for ReviewAnswered & Marked for review(will be considered for evaluation)CHEMISTRYSection-ISection-II51525354555657585960

The screening constant (S) for the outermost electron in Beryllium (Be) can be calculated using Slater's rules.

Beryllium (Be) has an electron configuration of 1s² 2s².

According to Slater's rules:

• For ns and np electrons:
  • Each electron in the same n level contributes 0.35 to S, except the electron itself.
  • Each electron in the n-1 level contributes 0.85 to S.
  • Each electron in the n-2 level (or lower) contributes 1.00 to S.

In the case of the outermost electron in Be (which is in the 2s orbital):

• There is one other 2s electron, which contributes 0.35 to S.
• There are two 1s electrons, each contributing 0.85 to S.

So, the screening constant S for the outermost electron in Be is 0.35 + 0.85*2 = 2.05.

Rounding to the nearest integer, the screening constant S for the outermost electron in Be is 2.