Since it goes to completion, we can use:
Use NaMaVa =NbMbVb
where
Na= moles of H+ in H2SO4
Ma= molarity of the acid
Va= volume of the acid
Nb= moles of OH- in NaOH
Mb= molarity of the base
Vb= molarity of the base
plug in the numbers
(2 moles of H+) (Volume acid) (10.00mL acid) = (1 mole of OH-) (.248M base) (18.71mL base)
20 V = 4.64
V= .232 M
Because the atom is neutral, it has no charge. For this to happen, the number of positive and negative charges must be the same. Therefore, because there are 11 -1 charged electrons, there must also be 11 +1 charged protons
So the answer is (2)