Uranium
The heaviest element with a one letter atomic symbol is uranium (symbol: U).
The chemical symbol for the element sodium consists of a first capital letter and a second non capital letter: "Na". The atomic number of sodium is 11. (The term "first symbol" used in the question has no particular meaning of which I am aware.)
CD is an invalid element symbol. Element symbols must only have one capitalized letter. This is also an invalid substance as there is no element with the symbol "D" However "C" is a valid symbol for Carbon and the atomic number is 6
The atomic symbol in a Lewis structure represents the nucleus of an atom, typically denoted by a letter. It does not include any electrons. The letter serves to identify the element that the atom represents.
The symbol for the chemical element sodium is Na and its atomic number is 11.
In the symbol of an element, the atomic number (representing the number of protons in the nucleus) is typically found as a subscript to the left of the element symbol. The atomic mass (representing the average mass of the element's isotopes) is usually found as a superscript to the left of the element symbol.
Atomic Symbol
Atomic Symbol
The atomic number of the element with the symbol Be is 4.
The chemical symbol for the element sodium consists of a first capital letter and a second non capital letter: "Na". The atomic number of sodium is 11. (The term "first symbol" used in the question has no particular meaning of which I am aware.)
CD is an invalid element symbol. Element symbols must only have one capitalized letter. This is also an invalid substance as there is no element with the symbol "D" However "C" is a valid symbol for Carbon and the atomic number is 6
The element represented by the letter 'U' is uranium (atomic number 92).
The atomic symbol in a Lewis structure represents the nucleus of an atom, typically denoted by a letter. It does not include any electrons. The letter serves to identify the element that the atom represents.
The symbol for the chemical element sodium is Na and its atomic number is 11.
An atomic symbol is a shorthand way to represent an element in the periodic table. It typically consists of one or two letters derived from the element's name in English or Latin. For example, the atomic symbol for oxygen is "O" and for carbon is "C."
The convention used for the chemical symbol of an element is so that you can determine the atomic mass.
Krypton is an element with symbol Kr and atomic number 36.
In the symbol of an element, the atomic number (representing the number of protons in the nucleus) is typically found as a subscript to the left of the element symbol. The atomic mass (representing the average mass of the element's isotopes) is usually found as a superscript to the left of the element symbol.