Which class of minerals is the most abundant in the crust and Earth's mantle? silicates sulfates halides sulfides oxides

silicates

Explanation:

Silicates are the most abundant minerals, they occur in different forms in the earth's mantle. They occur as ores of many useful metals and are found in soil. Just as soil is found everywhere, silicates in soil are also found everywhere hence they are the most abundant class of minerals.

"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."

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