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angiosperms
Why angiosperms are considered as the most advanced group of plant kingdom
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(a) The no. of atoms present in a molecule of an element is termed as Atomicity .
(b) The symbol representation of a
molecule of a substance is called its chemical formula .
(c) A group of atoms that react as a single unit is molecule .
(d) The combining capacity of an element is known as its valency .
(e) The tabular arrangement of elements in horizontal rows and vertical columns is called
periodic table .
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