Question

1) Which element has the most occupied principal energy levels?
a) C b) Cl c)Kr d)He

2) Which element is non-reactive? Why?
a) K b) Na c)F d) Ne

Answer 1

Answer:

1) Kr

2)Na because this smybol shows that Sodium is in octet configuration and is stable. Hence, it is reactive and will lose 1 electron to become stable. ... This means that it is no more reactive since it won't form any bond.

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Answer 2

Answer:

1) He

2) Ne

Neon is the element which is non reactive because it is noble gas as the nucleus has ability to gain more valence electrons weakens due to more nuclear shielding.