1. Most elements have a symbol which starts with their first two letters. Why do some elements such as gold (Au) and mercury (Hg), not follow this rule?
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2. What does the atomic number of an element represent?
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2. What does the atomic number of an element represent?
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Ans:
1. Au (gold), Ag (silver), Cu (copper), FE (iron), SN (tin), Pb (lead), Sb (antimony), and Hg (mercury): All were among the elements recognized by the ancient Greeks and Romans, and the abbreviations for those are based on a Latin or Greek term for the element.
2.The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element.
Explanation: