The symbol of the diatomic elements arranged in the order of atomic number?

Answer 1

Th elements that form stable* diatomic molecules at standard temperature and pressure are:

Atomic number 1: H

Atomic number 7: N

Atomic number 8: O

Atomic number 9: F

Atomic number 17: Cl

Atomic number 35: Br

Atomic number 53: I

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*Atomic number 85, At, would be expected chemically to form diatomic molecules, but all its isotopes are radioactively unstable.