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hii i have a doubt in the ques that how an we justify that the 5 th period has 18 elements

hii 
i have a doubt
in the ques that how an we justify that the 5th period has 18 elements

Grade:11

3 Answers

Ravleen Kaur
askIITians Faculty 1452 Points
6 years ago
Hello Student,

5 th period in the periodic table has s-block , p-block and d-block elements.

Hence max. no. of electrons accomodated by s, p & d sublevels are 2+ 6+10=18.

Sincemaximum no. of electrons accomodated= no. of elements in that period =18

Regards
IHE
Arun
25750 Points
6 years ago
Dear Rajdeep
 

While filling 5th shell according to aufbau principle 5s,5p.4d filled so 2 +6 +10 =18 electrons or elements are present in 5th shell.

We start the 5th period with 4s orbital. We can add 2 electrons in 4s. Then we fill 6 electrons in 4p orbital. Further we start filling the 4d orbital which can take 10 electrons. So in the 4th principal quantum energy stater, we can fill 18 electrons. Thus 5th period has 18 elements.

Regards

Arun (askIITians forum expert)

Anjali kumari
104 Points
5 years ago
It is just a rule.According to Aansu principal the tirth period has maximum 18 elements.If you like this answer please approve it.

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