Ow many atoms of each element are in 4Na3PO4? 3 sodium, 1 phosphorus, 4 oxygen
4 sodium, 4 phosphorus, 4 oxygen
12 sodium, 1 phosphorus, 4 oxygen
12 sodium, 4 phosphorus, 16 oxygen

Explanation:

4Na₃PO₄

Each of the elements is multiplied by the number in front of the compound, and also by the subscript.

Therefore:

Number of Sodium (Na) = 4 × 3 = 12

Number of Phosphorous (P) = 4 × 1 = 4

Number of Oxygen (O) = 4 × 4 = 16

"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."