wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Silicon (atomic no. 14) and phosphorous (atomic no. 15) belong to same period of the periodic table.

(a) State the electronic configuration of:

  1. Silicon
  2. Phosphorous

(b) Name the period in which above elements occur


Open in App
Solution

(a) Electronic configuration: It is the distribution of electrons in the various shells around the nucleus of an atom.
(i) Atomic number of Silicon (Si)= 14

  • As atomic number= Number of protons and
  • Number of protons= Number of electrons for a neutral atom
  • Electronic configuration of Silicon= 2, 8, 4 (K, L, M)

(ii) Atomic number of Phosphorous (P)= 15

  • Electronic configuration of Phosphorous= 2, 8, 5 (K, L, M)

(b) These elements occur in 3rd period.

  • The number of shells present in the atom of an element indicate the period number.
  • Example: Silicon and Phosphorous accommodate their electrons in three shells i.e. K, L, M. Therefore their period number is 3.
  • This can also be confirmed from the periodic table given below.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Higher Elements, Oxidation State
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon