1. which elements had complete outer shells? give the name and symbol for ea
give the name and symbol for each

All noble gases.

Helium (He), neon (Ne) , argon (Ar) , krypton (Kr ), xenon (Xe), radon (Rn)

Explanation:

All noble gases have complete outer shells.These are six elements Helium (He), neon (Ne) , argon (Ar) , krypton (Kr ), xenon (Xe), radon (Rn). These all are non reactive and stable.

Electronic configuration of Helium.

He₂ = 1s²

Electronic configuration of neon.

Ne₁₀ = [He] 2s² 2p⁶

Electronic configuration of argon.

Ar₁₈ = [Ne] 3s² 3p⁶

Electronic configuration of krypton.

Kr₃₆ = [Ar] 3d¹⁰ 4s² 4p⁶

Electronic configuration of xenon.

Xe₅₄ = [Kr] 4d¹⁰ 5s² 5p⁶

Electronic configuration of  radon.

Rn₈₆ = [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

we can see in case of all element the outer shell is complete.

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