Why is a second letter added to the chemical symbol of some elements?

Question

its for science

Answer 1

Most elements symbols come from their latin names. There is more than one element with a name beginning in N so to distinguish nickle from say nitrogen (you couldn't write them both as N) one is written as N and the other as Ni

Answer 2

Assuming that every one compounds of human frame are ordinarily carbon compounds (substituted or now not), the method would be: C10^22 H2x10^22 O10^22 N5x10^22 S10^22 P 10^21 Na 10^20 Cl 10^20 P 10^19 Ca 10^19 and the leisure of different most important factors (as Fe, Zn, Mg, and so on. perhaps within the variety of 10^five - 10^18)

Answer 3

to better distinguish its' abbreviation because some element have the same first letter names such as Hydrogen =H and Helium =He, both start with an H but they must be distinguished from each other so there is an extra letter for sybolization.

Answer 4

because there are well over one hundred elements and only 26 letters in the alphabet

as someone said, it helps to identify the element

Answer 5

becauase the first letter is already used for another element

Answer 6

for better identification.