Which describes the polarity in a water molecule?

a
partial positive charge on the oxygen atom because it pulls electrons from the hydrogen atoms

b
partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms

c
partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms

d
partial positive charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms

C

Explanation:

The two hydrogen atoms and one oxygen atom within water molecules form polar covalent bonds.

Water molecules do not have a net charge, but the polarity of water creates a slightly positive charge on hydrogen and a slightly negative charge on oxygen.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

it is the most commonly accepted one