Matter is composed of 1) pure substances. Any substance can't be 2) broken down into simpler 3) substances. Of the known 118 elements 11 are 4) synthetic (for example 5) technetium and 6) promethium) and 2 are 7) artificial (for example 8) americium and

Fill in the short narration of the text with the proper words and
phrases.
Matter is composed of 1) ______________ substances. Any substance can`t be
2)__________ into simpler 3) _______. Of the known 118 elements 11 are
4)________ ( for example 5)___._ and 6)_____) and 2 are _7)________(for example
8)____ and9) _____). The rest are 10______.
Combinations of elements are called 11)_____. When elements are combined
to form a compound, the product has quite 12)_________ characteristics from the
constituent elements.
Water isn`t an 13)_____, because it consists of 14)____ and 15) ____, which
can`t be 16)______ into simpler substances.
Most matter in the world is a 17)__________ of compounds. Seawater is a
mixture of 18) ______ and 19) ______. Mixtures can be separated into their
20)______________ ______ by 21) _______ processes.