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Question

ora Inter, c You'll Love Google Netflix MyMathLab l Pearson Apple Yahoo! Google Maps YouTube. www.saplinglearning.com/ibislcsslAccessibility.php?text... www.saplinglearning.com/ibis/cs Not set A 7.3/10 3/5/2017 o3:41 PM Print calaulator Periodic Table Question 20 of 22 University Science Books General Chemistry 4thEdition Presented by Saping Lemming Nonmetals gain electrons under certain conditions to attain a noble-gas electron con How many electrons must be gained by the element H? Which noble-gas electron configuration is attained in this process? O radon O argon O krypton O helium o Previous ® s vien 2 Check Answer O Next AE

Explanation / Answer

Ans. A non-metal gains electrons required to attain the electronic configuration of nearest inert (noble)-gas configuration. The inert gas configuration has a completely filled outermost orbital.

For example,

Electronic configuration =1s1

H-atom has only first s-orbital. The s- orbital (here, outermost orbital of H-atom) can hold a maximum of 2 electrons.

So,

the number of e required to fill s-orbital = Maximum number of e to be filled in – Available e

                                                = 2e – 1e = 1e

Thus, H-atom requires 1 e (1 electron) to completely fill its outermost orbital or to attain nearest inert gas configuration.

Now: part 2:

Electronic configuration of H-anion after accepting election =1s2

It is the electronic configuration of He gas.

Therefore, H-atom attained the electronic configuration of He gas.

Correct option. D. Helium

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