Identifying Characteristics of Atoms Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
B
С
A
20
20
19
F
E
9
D
Using the periodic table, complete the table to describe each atom. Type in your answers.
A
B
С
D

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.