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.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

the answer is na (sodium)