Most of it is historic. So Gold, for example, is Au, because the latin for gold is aurum. Lead (Pb) is plumbum in latin (lead pipes -> plumber!!!!), silver (Ag) is argentum, copper (Cu) is cuprum, etc.
Some elements are named after their names in Latin – a lot of scientific words come from Latin or Greek. This is because English takes a lot of words from those languages, and because Rome and Greece were very active in the sciences.
Also It was classically considered the language of the smart. We were invaded by the romans so people with higher social status spoke latin. The romans also lauded the Greeks who were way ahead of their time in terms of science, arts and philosophy. The sameis mostly true for the scientific names of animals.
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demilouise123 commented on :
Thankyou Suzanne