How many Valence electrons doe Boron have and does it have a cation or anion???

Boron and Aluminum

These atoms each have three valence electrons, so we would predict that these atoms want to bond covalently in order to gain 5 electrons (through sharing) to fulfill the octet rule.

Explanation:

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.