Question

please tell valency of elements upto 50

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Answer 1

hey here is your answer

NUMBER SYMBOLELEMENTVALENCE
Hydrogen1, 0,
Helium03
Lithium1,
Beryllium25,
Carbon4, 3, 2, 1, -Nitrogen5, 4, 3, 2, 1, 0,
Oxygen2, 1, 0,
Fluorine0, 
-Neon0
Sodium1,
Magnesium2
Aluminum3,
Silicon4, 3, 2, 1, -Phosphorus5, 4, 3, 2, 1, 0, -1, -2, -316SSulfur6, 5, 4, 3, 2, 1, 0, -1, -217ClChlorine6, 5, 4, 3, 2, 1, 0, -1, -218ArArgon019KPotassium1, -120CaCalcium221ScScandium3, 2, 122TiTitanium4, 3, 2, 0, -1, -223VVanadium5, 4, 3, 2, 1, 0, -1, -224CrChromium6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -425MnManganese7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -326FeIron6, 5, 4, 3, 2, 1, 0, -1, -227CoCobalt5, 4, 3, 2, 1, 0, -128NiNickel6, 4, 3, 2, 1, 0, -129CuCopper4, 3, 2, 1, 030ZnZinc2, 1, 031GaGallium3, 2, 132GeGermanium4, 3, 2, 133AsArsenic5, 3, 2, -334SeSelenium6, 4, 2, 1, -235BrBromine7, 5, 4, 3, 1, 0, -136KrKrypton2, 037RbRubidium1, -138SrStrontium239YYttrium3, 240ZrZirconium4, 3, 2, 1, 0, -241NbNiobium5, 4, 3, 2, 1, 0, -1, -342MoMolybdenum6, 5, 4, 3, 2, 1, 0, -1, -243TcTechnetium7, 6, 5, 4, 3, 2, 1, 0, -1, -344RuRuthenium8, 7, 6, 5, 4, 3, 2, 1, 0, -245RhRhodium6, 5, 4, 3, 2, 1, 0, -146PdPalladium4, 2, 047AgSilver3, 2, 1, 048CdCadmium2, 149InIndium3, 2, 150SnTin4, 2, -451SbAntimony5, 3, -352TeTellurium6, 5, 4, 2, 1, -253IIodine7, 5, 3, 1, 

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Answer 2

Valency depends on number of electrons in the outer shell in the structure of atoms. It depends on position of elements in the periodic table.

Element 1 is Hydrogen placed in !st group of 1st period and so on…

Element 2 is Helium in zero group not in group 2 as noble gas group or zero group.

Element 3 is Lithium in Group-I (One electron in the outer most shell) and period 2 (it has 2 shells)