25 Mn Question 5 (1 point)
The average atomic mass of B is 10.80 u Boron has only two stable forms 9 8 (10.00 u) and 3 (11.00 u).
What is the natural percent abundance of B?
A) 3.8%
B) 75%
C) 80%
OD 1.0%
E) 20

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

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.