Q. 4 B4.4( 31 Votes )

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.

1H, 7N, 20Ca, 16S, 4Be, 18Ar

Which of these elements belong to the second group?

Answer :

Electronic configuration:

The atomic number of hydrogen = 1

The electronic configuration of 1H = 1

The atomic number of nitrogen = 7

The electronic configuration of 7N = 2,5

The atomic number of calcium = 2

The electronic configuration of 20Ca = 2,8,8,2

The atomic number of sulphur = 16

The electronic configuration of 16S = 2,8,6

The atomic number of beryllium = 4

The electronic configuration of 4Be = 2,2

The atomic number of argon = 18

The electronic configuration of 18Ar = 2,8,8

Among the given elements, Ca and Be belong to second group. Because both has two electrons in the outermost shell. Thus, these two elements belong to second group.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
We like the Element of Surprise38 mins
We like the Element of Surprise38 mins
Mnemonics to Learn Modern Periodic Table38 mins
Important Mnemonics to Learn Modern Periodic Table48 mins
Exploring Periodic Table29 mins
Nature of Roots of Quadratic Equations51 mins
Quiz on Number of Solutions of an Equation24 mins
Importance of Competitive Exams46 mins
Quiz | Criterion of Similarity of Triangle45 mins
Importance of Bases40 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses