Atoms Atom

Protons

Neutrons

Electrons

1

8

10

8

2

10

9

10

3

9

9

9

4

8

11

8

Which two atoms are isotopes of one another?

A
Atoms 1&2

B
Atoms 1&3

C
Atoms 1&4

D
Atoms 2&3

1and 2 would be the correct answer

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.