Group Equation R² Group 1A y = 63.055x−2.737 y = 10.356x−1.902* * (Excluding H) R2 = 0.9981 R2 = 0.987* Group 2A y = 8.4232x−1.776 R2 = 0.9771 Group 3A y = 6.9729x−1.867 R2 = 0.9878 Group 4A y = 6.3518x−1.821 R2 = 0.9854 Group 5A y = 5.4589x−1.73 R2 = 0.9838 Group 6A y = 4.8691x−1.669 R2 = 0.979 Group 7A y = 4.1472x−1.566 R2 = 0.9737 Group 8A y = 3.7873x−1.532 (Excluding He) y = 16.077x−2.199 R2 = 0.9978 R2 = 0.9794** Group 3B y = 1.5012x − 1.136 y = −0.1801x + 0.6443 (Has been calculated with 3B) y = −0.1823x + 0.6425 y = −0.1785x + 0.6361 y = −0.1761x + 0.6231 y = −0.1726x + 0.6173 y = −0.1646x + 0.5934 y = −0.159x + 0.5833 y = −0.149x + 0.559 y = −0.1447x + 0.5504 y = −0.1399x + 0.5367 y = −0.1351x + 0.526 y = −0.1346x + 0.5201 y = −0.1318x + 0.5134 y = −0.1236x + 0.4962 y = −0.1224x + 0.4909 R2 = 0.9864 Group 4B y = 1.4459x−1.247 R2 = 0.9819 Group 5B y = 1.3652x−1.206 R2 = 0.9779 Group 6B y = 1.3303x−1.198 R2 = 0.9807 Group 7B y = 1.2625x−1.161 R2 = 0.9779 Group 8B1 y = 1.2306x−1.148 R2 = 0.9819 Group 8B2 y = 1.1743x−1.122 R2 = 0.9776 Group 8B3 y = 1.1689x−1.136 R2 = 0.9832 Group 1B y = 1.0883x−1.077 R2 = 0.9763 Group 2B y = 1.0516x−1.067 R2 = 0.9799