Helium
'Si' is the chemical symbol for the element 'Silicon'. Found in the Periodic Table in Group '4', immediately below carbon.
Iron
The chemical symbol for element number 33 is As, which stands for arsenic.
It stands for Hydro fluoride acid.Only 1st letter is capital in a symbol of an element.
The element symbol for the noble gas in the second period is He, which stands for Helium.
Sc is the symbol for SCANDIUM ... the 21st element.
The symbol for the element calcium.
There is no such element
The symbol Pb stands for the chemical element Lead, which is a heavy metal with the atomic number 82.
Baking soda is a compound therefore it cannot be an element. Since it cannot be an element, it does not have an element symbol. It does have a chemical formula though: NaHCO3.
It is Lr, which is the chemical symbol for Lawrencium.
Au is the symbol for gold, from the Latin aurum.