The balanced chemical equation for the reaction of hydrogen and oxygen is shown below. 2H2 + O2 → 2H2O
The number of moles of hydrogen that is needed to produce 0.253 mol of water is
O smaller than 0.253 mol.
O much greater than 0.253 mol.
O slightly greater than 0.253 mol.
O equal to 0.253 mol.

it should be p1 v1 = p2 v2

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

it's c. elements are placed in rows based on how may valencies electrons have.

you gotta add the following molecules so we can give u an answer

explanation: