Iodine
Ci means chlorine in the periodic table
Oxygen,
Helium
calcium
what ploh does mean
a family of the periodic table is like a group of elements of the same type.
Mo stands for Molybednium in the periodic table. It is placed in group-6.
Er means erbium in the periodic table. It belongs to lanthanide series.
The only thing it might mean would be number, but that is usually no. and not NO. NO would be nitrogen oxide (nitric oxide), but that would NOT appear in the periodic table, as it is a compound, and only ELEMENTS appear in the periodic table.
Th is element number 90 on the periodic table It is thorium, it is in the Actinides, and it is radioactive
Periods are horizontal rows. 7 periods are present in modern periodic table.
Chlorine