(AKS 2e) Group 2 metals bond with nonmetals or polyatomic ions. What question would a student need to know to form a compound with Group 2 metals? (DOK 2)

Will group 2 elements lose electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Will group 2 elements lose electrons to bond with nonmetals in group 16 in a

2:1 ratio?

Will group 2 elements gain electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Will group 2 elements gain electrons to bond with nonmetals in group 16 in a

2:1 ratio?

Will group 2 elements lose electrons to bond with nonmetals in group 17 in a

1:2 ratio?

Explanation:

Metals are electropositive in nature. This means that they loose electrons. Thus, metals form ionic bonds by loosing electrons to non metals.

Elements of group 2 have a valency of 2 while those of group 17 has a valency of 1 so the ratio in which group 2 elements bond with elements of group 17 is 1:2. Hence the answer.

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.