Question

Define the term :
(a) Elements
(b) Compounds

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Answer 1

An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.

Compounds are substances made from atoms of different elements joined by chemical bonds. They can only be separated by a chemical reaction. Common examples are water (H2O), salt (sodium chloride, NaCl), methane (CH4).

Answer 2

Answer:

Elements – Elements constitute the simplest chemical substances in which all the atoms are exactly the same.

Compounds – Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.