The preparation of the reagents that will be made theoretically requires equivalent amounts of the organic halide and magnesium, but slightly of the magnesium is normally used.

The preparation of the reagents that will be made theoretically requires equivalent amounts of the organic halide and magnesium , but slightly Grignard reagent of the magnesium is normally used.

Explanation:

When the metal is binded to a carbon atom in an alkyl group a Grignard reagent is formed. An alkyl group contains a carbon and a hydrogen atom. Bromine and Iodine are the most common halogen atoms used during their reactivity. The magnesium is coated with a layer of magnesium oxide which inhibits reactions with the organic halide. The Grignard reaction is often used as a initiator.

The reaction starts with hydrocarbyl halide, based on organic history it is a big deal in the number of C - C bond forming reactions is very small, and Grignard reaction is the best and most effective reactions.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."