In which group of elements do most atoms have completely filled s and p valence sublevels?

2 answers:

8 0

Noble or inert gases belong to the group 8A and have completely filled stable, outermost shells. The outermost electronic configuration of the noble gases can be represented as,

1. Helium - $1s^{2}$

2. Neon - $[He]2s^{2}2p^{6}$

3. Argon - $[Ne]3s^{2}3p^{6}$

4. Krypton - $[Ar] 3d^{10}4s^{2}4p^{6}$

5. Xenon - $[Kr] 5d^{10}6s^{2}6p^{6}$

6. Radon - $[Xe] 4f^{14} 5d^{10}6s^{2}6p^{6}$

So, the correct answer will be noble gases.

maw [93]3 years ago

7 0

Group 8A or Noble Gases

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4. Energy can be conserved by -

mart [117]

Energy can be conserved by efficient energy use.

Answer: Option A

<u>Explanation:</u>

Energy can be transferred from one form to another, but it cannot be destroyed or created. So it can be conserved if efficiently used. Thus efficient usage of energy lead to conservation of energy. Due to conservation of energy, the forces can be renewable and non-renewable.

So, we should know how the input energy can be completely converted to another form of energy leading to efficient usage of energy without any loss. As if there is no loss, input energy will be equal to output energy leading to 100% efficiency.