Question

Which molecular formula is written incorrectly?

CO
CH4
Br4Si
N2

Answer 1

I believe your answer would be the 3rd one

Answer 2

`Br_(4)Si` is written incorrectly

Step-by-step explanation:

In a molecular formula, the central atom in it's lewis structure is written first followed by other bonded atoms.

The least electronegative atom (except H) is the central atom in a lewis structure.

In
`Br_(4)Si`, Si is the least electronegative atom as Br has higher electronegativity than Si. Therefore Si is the central atom in lewis structure of
`Br_(4)Si`. So molecular formula of
`Br_(4)Si` should be written as
`SiBr_(4)`.

In all other cases, the least electronegative atom have been written first.

So,
`Br_(4)Si` is written incorrectly.