Number of Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
A
7
B
15
С
D
E
26
56
F
Using the periodic table, complete the table to describe each atom. Type in your answers.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

16

explanation:

the marks go by 4s

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.