Question

The element with atomic numbers 9,17,35,53 and 85 belong to noble gases. Column 2…
(A) True
(B) False

Answer 1

Hint: In the periodic table, noble gases are placed in the 18th group,in the p-block. These gases are stable due to completely filled octets.

Complete step by step answer:
Features of Noble gases:
- These are chemical elements in group 18 of the periodic table.
- They are the most stable due to having the maximum number of valence electrons their outer shell can hold.
-Therefore they rarely react with other elements.
- This chemical series contains helium, neon, argon, krypton, xenon and radon.
-Here, the atomic number of elements is 9,17,35,53,85.
Electronic configuration of elements will be
\[9 - 1{s^2}2{s^2}2{p^5}\]
\[17 - 1{s^2}2{s^2}2{p^6}3{s^2}3{p^5}\]
\[35 - {\left[ {Ar} \right]^3}{d^{10}}4{s^2}4{p^5}\]
\[53 - {\left[ {Kr} \right]^4}{d^{10}}5{s^2}5{p^5}\]
\[85 - {\left[ {Xe} \right]^5}{d^{10}}6{s^2}6{p^5}\]
-The pattern shows that all elements have 7 electrons in their outermost valence shell and all these elements belong to halogens, not noble gases.These atomic number gives the electronic configuration \[n{s^2}n{p^5},\] which are of halogen or 17th group.

So, the answer is false.

Note:
The group of halogens is the only periodic table group that contains elements in three of the main states of matter at standard temperature and pressure. All of the halogens form acids when bonded to hydrogen. Most halogens are typically produced from minerals or salts.