How many atoms of silicon are in 0.75 mol of disilicon hexahydride, Si2H6? A.4.5x 1023 atoms B.6.02 x 1023 atoms C.8.0 x 1023 atoms D.9.0x1023 atoms

D. 9.0x10²³ atoms

Explanation:

First we use Avogadro's number to calculate how many molecules of Si₂H₆ are there in 0.75 mol:

There are 2 Si atoms in one Si₂H₆ molecule, that means that in 4.52x10²³ Si₂H₆ molecules there will be:

Thus the answer is option D.

"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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