As runrig suggests below the more general s/H\d*//g; may be more appropriate to your needs.

It does help, but what about Hg element? When I enter Hg, it gives me zero as output.

In reply to Re^2: How to avoid an alphabet and integer next to it in a string? by piscean
in thread How to avoid an alphabet and integer next to it in a string? by piscean

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