(a)   is the symbol for the element Helium.

(a)   is the symbol for the element Oxygen.

(a)   is the symbol for the element Fluorine.

(a)   is the symbol for the element Calcium.

(a)   is the symbol for the element Iron.

(a)   is the symbol for the element Lithium.

(a)   is the symbol for the element Hydrogen.

(a)   is the symbol for the element Boron.

(a)   is the symbol for the element Aluminum.

(a)   is the symbol for the element Silver.

(a)   is the symbol for the element Potassium.

(a)   is the symbol for the element Nitrogen.

(a)   is the symbol for the element Carbon.

(a)   is the symbol for the element Argon.

(a)   is the symbol for the element Neon.

(a)   is the symbol for the element Copper.

(a)   is the symbol for the element Sodium.

(a)   is the symbol for the element Sulfur.

(a)   is the symbol for the element Arsenic.

(a)   is the symbol for the element Magnesium.

(a)   is the symbol for the element Zinc.

(a)   is the symbol for the element Phosphorus

(a)   is the symbol for the element Silicon.

(a)   is the symbol for the element Chlorine.