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Chemistry
Gardner

Short answer questionsD. Answer in brief.1. What is an element?2. Define an atom and a molecule.3. What is the formula of nitric acid? Name theatoms present in one molecule of nitric acid.​

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  1. In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means.
  2. A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.
  3. The chemical formula of nitric acid is HNO3 and it is made up of one hydrogen atom, one nitrogen atom, and three oxygen atoms.
  4. Nitric acid: a highly corrosive acidic substance
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