The first letter is a capital letter; example for sodium: Na.
It is a general tradition to write the symbol of a chemical element with two letters from the name.
The symbol, He, comes from the first two letters of the element helium
The symbol comprises the first two letters of the element's name.
The chemical symbol is one or two letters that represent an element.
The symbol (He) comes from the first two letters of the word Helium
the only two letters in the element symbol are J and Q
The symbol comprises the first two letters of the name of the element.
The chemical symbol of a chemical element is formed from one or two letters, extracted from the name of this element.
The symbol for the element neon is Ne. It is derived from the first two letters of the element.
The symbol was taken from the first two letters of the element, Helium
The symbol for neon comes from the first two letters of the element Neon.
The symbol for xenon is Xe. It is obtained from the first two letters of the element.