Question 2 of 10 which to elements have similar properties and 8 electrons in their
O A Arsenic and antimony
B Krypton and xenon
Clodine and bromine
A Sodium and potassium

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B : Krypton and Xenon

Explanation :-

Because they are noble gases. They have 8 electrons in their outermost shells and have similar chemical properties.

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.