Q.

Statement-1: The 5th period of periodic table contains 18 elements not 32.

Statement-2: 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 b accommodated.

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a

 Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

b

 Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.

 

c

Statement-1 is True, Statement-2 is False.

d

Statement-1 is False, Statement-2 is True.

answer is A.

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Detailed Solution

18 elements, not 32, make up the fifth period of the periodic table.

n=5,

l=0 to (n1),

l=04; 0,1,2,3,4

The beginning orbital for the fifth period is 4 s. Consequently, 2 electrons fill up 4s. 4p is multiplied by six electrons, and 4d by ten. Therefore, a total of 18 electrons or elements may exist.

 

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