Question

অতিথির রচনা৷ বেড়াতে যাওয়ার শিক্ষা সফরে কোন কোন অভিজ্ঞতা ​

Answer 1

In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number.