A chromate ion consists of four oxygen atoms bonded to a chromium atom. It has two extra electrons. The formula of this ion:

2 answers:

6 0

The formula of this ion is CrO42– . The correct option among all the options that are given in the question is the third option or the last option. The other choices are incorrect and can be easily negated. I hope that this is the answer that you were looking for and the answer has come to your desired help.

Feliz [49]2 years ago

5 0

Answer: The correct answer is $CrO_4^{2-}$

Explanation:

Chromate ion is formed by the combination of one chromium atom and four oxygen atoms. The ion formed has two more electrons.

An ion which has extra electrons carries a negative charge on them and the ion which has more electrons carries a positive charge on them.

As, chromate ions have 2 extra electrons, Thus, it carries a charge of -2.

Hence, the correct answer is $CrO_4^{2-}$

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