Ca was already being used for calcium. Also, the second letter of the abbreviation is generally chosen to suggest the name of the element rather than being the literal second letter in the name.
Sodium hydroxide is an a compound; not an element. As such it has a formula rather than a symbol: NaOH.
The electronegativity of caesium is higher.
The symbol "0" does not correspond to any element on the periodic table. Elements are represented by one or two-letter symbols, such as H for hydrogen or O for oxygen. The number "0" typically represents a numerical value rather than an element. If you have a specific context in mind, please provide more details!
No, each element has its own unique chemical symbol. Chemical symbols are used to represent individual elements, and no two elements have the same symbol.
sodiumsodiumsodium!(why do we have to write it more than once?
Sodium hydroxide is an a compound; not an element. As such it has a formula rather than a symbol: NaOH.
Barium is smaller than caesium. Different elements have different atomic radii, with caesium having a larger atomic radius compared to barium.
Since turquoise is a mineral rather than an element it does not have a symbol as a chemical element. If you wish more information about it you might look at its page on wikipedia.
Antimony is an element. Chemical symbol of it is Sb. It is in the p block.
Argon is element number 18, chemical symbol (rather than 'formula'): Ar
This chemical element is francium (Fr).
Sodium is an element and therefore has a "symbol" rather than a "formula". The symbol, Na, is already given in the question.
Assuming you meant Aluminium - no - it's an element.
The electronegativity of caesium is higher.
Pine sol isn't an element. It is a solution of many compounds (molecules composed of more than one element).
Francium is an alkali metal, similar to caesium. Water (H2O) is a compound,not an element. Francium, although it is believed to have never been tested, is thought to have been the most reactive element with water. It is among the alkali metals in group 1 on the periodic table of elements.
Atoms of the element cesium (also caesium), symbol Cs, element number 55.