--------+-----------+-----------+-----------+-----------+-----------+ Periods | GROUP | GROUP | GROUP | GROUP | GROUP | | 0 | I | II | III | IV | |A B|A B|A B|A B|A B| --------+-----------+-----------+-----------+-----------+-----------+ 1 |H==1.008 | | | | | 2 |He=4 |Li=7.03 |Be=9.1 |B=11 |C=12 | --------+-----------+-----------+-----------+-----------+-----------+ 3 | Ne=20|Na=23.05 | Mg=24.36| AL=27.1| Si=28.4| --------+-----------+-----------+-----------+-----------+-----------+ 4 |A=39.9 |K=39.15 |Ca=40.1 |Sc=44.1 |Ti=48.1 | | | | | | | | | | | | | --------+-----------+-----------+-----------+-----------+-----------+ 5 | | Cu=63.6| Zn=65.4| Ga=70| Ge=72.5| --------+-----------+-----------+-----------+-----------+-----------+ 6 |Kr=81.8 |Rb=85.5 |Sr=87.6 |Y=89 |Zr=90.6 | | | | | | | | | | | | | --------+-----------+-----------+-----------+-----------+-----------+ 7 | | Ag=107.93| Cd=112.4| In=115| Sn=119| --------+-----------+-----------+-----------+-----------+-----------+ 8 |X=128 |Cs=132.9 |Ba=137.4 |La=138.9 |Ce=Yb* | | | | | |140.25-173 | | | | | | | --------+-----------+-----------+-----------+-----------+-----------+ 9 | Au=197.2| Hg=200| Tl=204.1| Pb=206.9| Bi=208.5| --------+-----------+-----------+-----------+-----------+-----------+ 10 | | |Ra=225 | |Th=232.5 | --------+-----------+-----------+-----------+-----------+-----------+ | | R_{2}O | RO |R_{2}O_{3} | RO_{2} | | | RH | RH_{2} | RH_{3} | RH_{4} | --------+-----------+-----------+-----------+-----------+-----------+ ==================part 2==============