Question

How many elements have 9 valence electrons?

Answer 1

Hey there! Some molecules can accommodate more than 8 valence electrons because they have expanded valence shells. These molecules are from periods 3 or higher because starting from n=3, atoms have d-orbitals that can accommodate for more that 9 valence electrons.

Answer 2

Answer: 4 (Co, Rh, Ir, and Mt)

Explanation: they’re all part of group 9 from the periodic table