An ion A. is an ion with a negative charge
B. attracts ions with a negative charges
C. results when an alkaline-earth metal loses one of its outermost electrons
D. has more protons than electrons

C. results when an alkaline-earth metal loses one of its outermost electrons

Explanation:

An ion can be said to result when an alkaline - earth metal loses one of its outermost electrons.

Ions are charged substances that takes part in chemical reaction.

When there is an inequality between the number of protons and electrons within an atom, an ion forms.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

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.