Silicon is a chemical element originated from the Latin ‘silex’ or ‘silicis’, meaning flint. It was first mentioned in 1824 and observed by J. Berzelius. The isolation was later accomplished and announced by J. Berzelius. “Si” is the canonical chemical symbol of silicon. Its atomic number in the periodic table of elements is 14 with location at Period 3 and Group 14, belonging to the p-block. The relative atomic mass of silicon is 28.0855(3) Dalton, the number in the brackets indicating the uncertainty.
Chromium is a chemical element originated from the Greek ‘chroma’, meaning colour. It was early used before 1 AD and discovered by Terracotta Army. “Cr” is the canonical chemical symbol of chromium. Its atomic number in the periodic table of elements is 24 with location at Period 4 and Group 6, belonging to the d-block. The relative atomic mass of chromium is 51.9961(6) Dalton, the number in the brackets indicating the uncertainty.
