The elements in the first two groups and in the last 6 groups. Basically all the elements except the inner transition and transition elements.
chemically combined elemets
Carbon
Elemets of the skin
it contains only oxygen
Two--mercury and bromine
combined form
Gold is an element so it only contains the element, gold.
Symbols.
In the periodic table, the elements are arranged by atomic number
plant fertilizer. if two elemets are added you can make gun powder.
Atom number 20 is Calcium (period IV, group 2)
At Room Tempeture, Metals contain the most Elemants.