O stands for Oxygen. O2 is just a molecule consisting of two oxygen atoms.
Added:
In the Periodic Table Oxygen, symbol O, stands for the atomic element number 8, the first in group 16
By convention only single atom symbols, such as O and H and C, are used in the periodic table, so you will not find O2 in it.
The elemental symbol O stands for oxygen.
O2 is the diatomic molecule of oxygen. Molecules are not on the periodic table, elements are.
Oxygen
11 is the atomic number for the element sodium in the periodic table.
Calcium.
cerium
iron
Oxygen
The symbol O2 in the periodic table stands for oxygen gas, which is a diatomic molecule composed of two oxygen atoms. Oxygen is a reactive element that is essential for respiration in living organisms and is also a key component of the Earth's atmosphere.
N stands for Nitrogen on the periodic table.
Beryilium
iodine
there is no such element
iodine
'h' doesn't mean anything in the Periodic Table. 'H' (Capital Letter) is hydrogen 'He' (Capital Letter followed by a lower case letter) is Helium. Careful with your use of capital/lower case letters. Follow as shown in the Periodic Table.
Argon is what Ar stands for on the Periodic Table of elements.
Sr stands for strontium on the periodic table of elements.
11 is the atomic number for the element sodium in the periodic table.
potassium