Rubidium, a soft white metal.
Apart from symbols taken from their ancient names (like Ag for Silver - from Argentum, and K for potassium from Kalium) almost all other symbols are taken from the element's name - the first letter and, where necessary, another letter too - usually the next one. So C is Carbon, but when Calcium was discovered, it could not be give the symbol C as well, so it was given the symbol Ca. In the same way Hydrogen has the symbol H, but Helium cannot be given the symbol H too, so it has the symbol He, being the first two letters of its name. If there are two elements with the same two first letters (like magnesium and manganese) then another two letters are chosen instead - in this case the first and third letters rather than the first two - making the symbol of magnesium Mg, and that of manganese Mn. Similarly, for neon, N is the symbol for Nitrogen, and so Ne was chosen for Neon, being the first two letters of the name.
This is known as the chemical symbol for the element.
Aquaman
With a capital whatever the element begins with and perhaps a second lowercase letter that is usually the second letter of the element but not always. (Ar represents Argon but As stands for Arsenic because "Ar" is already used.) Elements must also be neutrally charged.
Subshell letters indicate electron shells. The letters K-Q or numbers 1-7 are called subshell letters. They are placed in superscript form.
The radioactive element that begins with the letter R is radium. Radium is a highly radioactive element and is found in uranium ores. It emits alpha, beta, and gamma radiation.
Uranium
Element 99 on the periodic table is einsteinium.
ununquadium - a radioactive transuranic element
The letter (or letters) represents the abbreviation for that element, i.e. it represents the symbol used to represent that element.
They are the symbols for the elements . Often they are some of the letters of the English name.For example, Si means Silicon. Silver cannot be Si as well. Therefore, we use the Latin translation, Argentium, to create Ag.
The letter in the boxes are symbol of the element. It represents name of the element.
The letters are a one- or two-letter symbol assigned to each element
periodic table
The first letter is a capital letter; example for sodium: Na.
Elements are abbreviated by one or two letters. Most elements are abbreviated by one letter, but some elements are abbreviated by two letters, typically when the one-letter abbreviation is already taken by another element.
The only letter not used as a symbol for an element is the letter "J." This is because the International Union of Pure and Applied Chemistry (IUPAC) does not allow symbols that are the same as initial letters of elements that have already been named.