A chemical reaction is shown. 4P + 5O2 P2O5
What coefficient needs to be placed in front of the products to make sure the law of conservation of
matter is followed?

The coefficient that needs to be placed in front of the products is 2

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above