They are all examples of the Ph scale xx
The elements He, Cu, and Hg are examples of elements, that naturally occur, in the environment. These particular ones would represent the three states of matter which include gases, solids, and liquids respectively. There is a fourth state, plasma, which allows the matter to carry charges.
They are symbols that are in the periodic table. He = Helium Cu = Copper Hg = Mercury
Hg, Cu, Fe, W
Au, Gold Hg, Silver Cu, Copper Ni, Nickel
The formula for copper (ll) hypochlorite would be Cu(ClO)2 CuClO is a +1 state of copper, called copper (l) hypochlorite.
water(H2O), mercury(Hg).
Copper has the chemical symbol Cu, but on commodity exchanges like the CME Group, copper futures are commonly represented by the ticker symbol HG to avoid confusion with gold futures, which are represented by the symbol AU (from the Latin word for gold, "Aurum"). HG stands for the former name of copper, "hydrargyrum," which is derived from the Greek words for water (hydor) and silver (argyros). This historical reference is used to differentiate copper from other metals in trading platforms.
cu,ag, and au are all in what group
HG Wells had two brothers who teased him all the time.
Bi, Ni, Pd, Pt,Cu, Mn, Hg, Pb, Sn, Au, Ag, Zn, Cd, Fe, Sb
These are all chemical elements found on the periodic table. Cu is copper, Fe is iron, Pb is lead, Mg is magnesium, Al is aluminum, O is oxygen, N is nitrogen, and H is hydrogen.
Gold is a metal that won't react with dilute hydrochloric acid.