Question

matter arpund us pure is lesson par notes banana hai​

Answer 1

Answer:

In chemistry, a pure element means a substance whose atoms all (or in practice almost all) have the same atomic number, or number of protons. Nuclear scientists, however, define a pure element as one that consists of only one stable isotope.

Explanation:

(Elements and compounds are also known as Pure substances)A pure substance or chemical substance is a material that has a constant composition (is homogeneous) and has consistent properties throughout the sample. A pure substance participates in a chemical reaction to form predictable products. In chemistry, a pure substance consists only of one type of atom, molecule, or compound. In other disciplines, the definition extends to homogeneous mixtures.