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Modern Periodic Table

First long pe...

Question

First long period contains ______ elements.

A

8

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B

18

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C

32

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D

2

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Solution

The correct option is B $18$
first long period means fourth period which contains 19 to 36 atomic no. means 18 electron.

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Similar questions

Q. First long period has 18 elements.

Q. Assertion :Across the period effective nuclear charge decreases. Reason: The third period contains only 8 elements and not 18 like 4th period.

In the modern periodic table, which period contains 32 elements?

Q. Assertion :The

5^{t h}

period of 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.

Q. Statement I: The

5^{t h}

period of the periodic table contains 18 elements and not 32.
Statement II:

n = 5, l = 0, 1, 2 a n d 3

. The order in which the energy of the orbitals 4d, 5s and 5p increases is

5 s < 4 d < 5 p

. The total number of orbitals available are 9 and thus, 18 electrons can be accomodated.

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