QuesLIUI 11 point)
Elements in the noble gas family are considered stable because their outer energy
levels are

Elements in the noble gas family are considered stable because their outer energy levels are very low.

Explanation:

Noble gas is also called inner gases because they are stable due to the completion of outermost shell. Other elements in the periodic table are very reactive so they wants to achieve the electronic configuration of noble gas so that's why they make chemical bonds with each other.

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.