An atom has at least one positive proton and at least one negative electron. which of the following is true about the protons and electrons in an atom?
a.
protons and electrons are far apart with empty space in between.
b.
protons and electrons are stuck together in neutral pairs.
c.
protons and electrons orbit close together around a central nucleus.
d.
protons and electrons are mixed together in a cloud.

proton and electrons orbit close together around a center nucleus

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.