Across a period, the effective nuclear charge increases and therefore it becomes to remove an electron,
a Easier
b Harder
C Impossible
d None of the above

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

it takes on an electronical energy

it is b that is the answer.