Doi it p?l Share with your friends Share 0 Goutam Pradhan answered this Solution:X consists of 56 nucleonsNo. of nucleons=no. of neutrons + no. of protonsY3060 has 30 electrons (30 protons) [No of electrons=no. of protons=Atomic number in a neutral atom] and 60 nucleons (protons+neutrons)Number of neutrons in Y = 60-30-30And it is also given, Y is isotonic with X.So, X also has 30 neutrons.X has 56 nucleons∴No of protons(Atomic number of X) =56-30=26Z=19(K) to 36(Kr) belongs to 4th periodSince 18(Z of Ar)+8=26, group=8 (∵it will be 8th element to the right from Group1(Alkali metals)The element is Fe(Iron) 0 View Full Answer