Question 3 (2 points)
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Identify the isoelectronic elements. (Species with same number of electrons in the
System)
OC) p3-, s2-, Cl-, kt, Ca2+
9
( E) Ne, Ar, Kr, Xe, He
OD) Zn2+, Co2+, Cu2+, Cr2+, Cd2+
O A) CI", F, Br, I., At
B) N3-, 52-, Br", Cst, sr2+
I
einte

i believe it is c.) 1575 j.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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