Pls answer question 10 Share with your friends Share 0 Vartika Jain answered this Dear Student, Mass number = Number of electrons + Number of neutronsTherefore, 35= Number of electrons+18or, Number of electrons = 35-18=17and, Atomic number = Number of electrons = 17Electronic configuration = 2,8,7Group number = 10+7=17 groupPeriod= no. of shells = 3Valency = 1 as it requires 1 more electron to complete its octet 0 View Full Answer Mat Mathew answered this atomic no of X = 35-18 = 17 element is Cl configuration-2,8,1 valency-1 3rd PERIOD and 17th GROUP 1 Assassin answered this hey mass no. = 35 therefore atomic no. = 17 so it's chlorine therefore it's electronic configuration is (2,8,7) the group no. is 17 and period no. is 3 hope it helps. 1 Bharath answered this It's atomic number is 17. It belongs to 3rd period and 17th group. . Its valency is 1. 0 Tejas.n answered this Mass number=atomic no + neutrons no Atomic number=35-18=17 Electronic configuration=2,8,7 Element name chlorine 0
