Write the valency of hydrogen, magnesium, carbon and sodium. Share with your friends Share 0 Chirag Gupta answered this Dear StudentWhen 1, 2 or 3 electrons in valence shell, then valency is equal to number of valence electrons.When 4, 5, 6 and 7 electrons in valence shell, then valency is (8-number of valence electron).Electronic configuration is as:H: 1Mg: 2,8,2C: 2,4Na: 2,8,1Valence electrons in H, Mg, C and Na is 1,2,4 and 1 respectively.Hence the valency for H, Mg, C and Na is 1,2,4 and 1 respectively.Regards 1 View Full Answer
