A compound is formed by chemical combination of two or more elements.
Fill in the blanks:
(a) Matter is neither …………….. nor ……………... in a chemical reaction.
(b) In a compound, the constitute elements are always present in a definite proportion by ……………. .
(c) Two or more elements combine to form ………………… .
(d) The combining capacity of an element is known as its ………………. .