Question

How would justify that there are only 18 element in fifth period of periodic table
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Answer 1

Explanation:

the 5th period of the periodic table contains 18 elements not 32. reason n=5, l=0, 1, 2 , 3 . the order in which the energy of available orbitals 4d, 5s, and 5p increases is 5s<4d<5p. and the total number of orbitals available are 9 and thus 18 electrons can be accommodated.

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Answer 2

Answer:

The 5th period of the periodic table contains 18 elements not 32. Reason n=5, l=0, 1, 2 , 3 . The order in which the energy of available orbitals 4d, 5s, and 5p increases is 5s<4d<5p. and the total number of orbitals available are 9 and thus 18 electrons can be accommodated.