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What is the electron configuration of the element in group 4A and period 4 of the periodic table?
a. [Ne]3s 3p?
c. [.4r]3d104324p
b. [.4r3452
d. [Ar]45*4p?

b is the correct answer

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.