1)Which of the following best describes the valence-electron configuration of the group 3A elements?

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Which of the following best describes the valence-electron configuration of the group 3A elements?

ns2np1

ns2np2

ns2np3

ns2np4

2)The chemical formula for diborane is B2H6. Each of the boron atoms in a diborane molecule is sp3 hybridized, but they are not connected to each other, only to hydrogen atoms. Two of the hydrogen atoms in diborane take on an unusual bonding arrangement in which they form two bonds each in a cyclic B−H−B−H ring. The other four hydrogen atoms have the typical bonding arrangement of one bond each.

Part C

Draw a diborane molecule.

3) What is the oxidation state of the H atom in H2

 in equation 2NaCl(aq)+2H

2

O(l)→H

2

(g)+Cl

2

(g)+2NaOH(aq)

?

Express your answer as a signed integer.

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