Mg + N2 → v Mg3N2 v Ca(NO3)2 + v Na2SO4 v Caso4 + v NANO3 v Fe2(SO4)3 + КОН — v K2SO4 + v Fe(OH)3 v N2 + 02 v NO2 v S + SO3 v CO + v O2 v CO2 v Cu(NO3)2 v CuO + v NO2 + v O2

1A 8A H 2A 3A 4A 5A 6A 7A He B C NO F Ne Li Be Na Mg 3B 4B 5B 6B 7B 8B - 1B 2B A1 Si PS CI Ar K Ca sc Ti v Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb TeI Xe Cs Ba La Hf Ta w Re Os Ir Pt Au Hg TI Pb Bi Po At Rn Fr Ra Ac Rf Ha Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the strontium ion, Sr*.

1A 8A H 2A 3A 4A 5A 6A 7A He BC NO F Ne Li Be r 8B - 1B 2B A1 si P S cI Ar K Ca sc Ti v Cr Mn Fe Co NI Cu Zn Ga Ge As Se Br Kr Na Mg 3B 4B 5B 6B 78 Rb Sr Y zr Nb Mo Tc Ru Rh Pd Ag cd In Sn Sb Te I Xe Cs Ba La Hf Ta w Re Os Ir Pt Au Hg TI Pb Bi Po At Rn ** Fr Ra Ac Rf Ha Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No Lr The element iodine would be expected to form 1 |covalent bond(s) in order to obey the octet rule. Use the octet rule to predict the formula of the compound that would form between iodine and hydrogen , if the molecule contains only one iodine atom and only single bonds are formed. Formula:

led 1or this 1A 8A H 2A 7A He 3A 4A 5A 6A Li Be B CNO F Ne Na Mg 3B 4B 5B 6B 7B 8B - 1B 2B A1 Si P S CI Ar K Ca sc Ti v Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y zr Nb Mo Tc Ru Rh Pd Ag ca In Sn Sb Te I Xe Cs Ba La Hf Ta w Re os Ir Pt Au Hg TI Pb Bi Po At Rn ** Fr Ra Ac Rf Ha Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No Lr Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the sulfide ion, S².