Read the given expression.
x = atomic number − number of core electrons
which of the following explains the identity of x and its trends down a group?
a). x is the effective nuclear charge, and it remains constant down a group.
b). x is the screening constant, and it remains constant down a group.
c). x is the effective nuclear charge, and it increases down a group.
d). x is the screening constant, and it increases down a group.

answer; /// i do believe that the correct answer is (a) boiling

"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."

l dont know l am s sorry

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence