Question

why is the symbol S for sulphur, but Na for sodium and Si for silicon???? ​

Answer 1

While naming an element first letter of the element is taken and written in capitals (e.g. for sulphur, we use the symbol S). In case if the letter is already adopted. We use a symbol derived from latin word of the element name (e.g. for sodium/Natrium, we use the symbol Na). In some cases, we use the initial letter in capital together with a small letter from its name (e.g. for silicon, we use the symbol Si).

Answer 2

Answer:

While naming an element first letter of the element is taken and written in capitals (e.g. for sulphur, we use the symbol S). In case if the letter is already adopted. We use a symbol derived from latin word of the element name (e.g. for sodium/Natrium, we use the symbol Na).