Question

valency, atomic mass and symbol of first 30 elements in periodic table

Answer 1

ElementAtomic NumberAtomic MassValencyHydrogen11.0079(-1), +1Helium24.00260Lithium36.941+1Beryllium49.0122+2Boron510.811-3, +3Carbon612.0107(+2), +4Nitrogen714.0067-3, -2, -1, (+1), +2, +3, +4, +5Oxygen815.9994-2Fluorine918.9984-1, (+1)Neon1020.17970Sodium1122.9897+1Magnesium1224.305+2Aluminum1326.9815+3Silicon1428.0855-4, (+2), +4Phosphorus1530.9738-3, +1, +3, +5Sulfur1632.065-2, +2, +4, +6Chlorine1735.453-1, +1, (+2), +3, (+4), +5, +7Potassium1839.09830Argon1939.948+1Calcium2040.078+2Scandium2144.9559+3Titanium2247.867+2, +3, +4Vanadium2350.9415+2, +3, +4, +5Chromium2451.9961+2, +3, +6Manganese2554.938+2, (+3), +4, (+6), +7Iron2655.845+2, +3, (+4), (+6)Nickel2758.6934+2, +3, (+4)Cobalt2858.9332(+1), +2, (+3), (+4)Copper2963.546+1, +2, (+3)Zinc3065.39+2