Question

17. How will you justify presence of 16 elements in 5th period

Answer 1

Answer:

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.

Explanation:

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Answer 2

First period contains 2 elements hydrogen (H=1),and helium(He=2)

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)3rd period contains 8 elements from Na(sodium=11) to Argon(Ar=18)

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)3rd period contains 8 elements from Na(sodium=11) to Argon(Ar=18)4th period contains 18 elements from. Potassium (K=19) to Krypton (Kr=36)

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)3rd period contains 8 elements from Na(sodium=11) to Argon(Ar=18)4th period contains 18 elements from. Potassium (K=19) to Krypton (Kr=36)5th period 18 elements from cesium (Cs=37)to xenon(Xe=54)

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)3rd period contains 8 elements from Na(sodium=11) to Argon(Ar=18)4th period contains 18 elements from. Potassium (K=19) to Krypton (Kr=36)5th period 18 elements from cesium (Cs=37)to xenon(Xe=54)This can easily be followed from the below electronic configuration:-

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)3rd period contains 8 elements from Na(sodium=11) to Argon(Ar=18)4th period contains 18 elements from. Potassium (K=19) to Krypton (Kr=36)5th period 18 elements from cesium (Cs=37)to xenon(Xe=54)This can easily be followed from the below electronic configuration:-2,8,8,18,18

Second period contains 8 elements from Lithium (Li=3) to Neon(Ne=10)3rd period contains 8 elements from Na(sodium=11) to Argon(Ar=18)4th period contains 18 elements from. Potassium (K=19) to Krypton (Kr=36)5th period 18 elements from cesium (Cs=37)to xenon(Xe=54)This can easily be followed from the below electronic configuration:-2,8,8,18,18Which show elements in 1st ,2nd,3rd ,4th,5th period respectively.

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.

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.