| | | | | 11 | —— | Gold. | Mercury. | Thallium. | | | Au = 197.2 | Hg = 200.0 | Tl = 204.1 | | | | | | 12 | —— | —— | Radium. | —— | | | | Rd = 224 | | -------+------------+------------+------------+------------+- -------+------------+------------+------------+------------+- Series.| Group IV. | Group V. | Group VI. | Group VII. | -------+------------+------------+------------+------------+- 0 | —— | —— | —— | —— | | | | | | 1 | | | | | | —— | —— | —— | —— | | | | | | 2 | Carbon. | Nitrogen. | Oxygen. | Fluorine. | | C = 12.0 | N = 14.04 | O = 16.0 | F = 19.0 | | | | | | 3 | Silicon. |Phosphorus. | Sulphur. | Chlorine. | | Si = 28.4 | P = 31.0 | S = 32.06 | Cl = 35.45 | | | | | | | | | | | | | | | | 4 | Titanium. | Vanadium. | Chromium. | Manganese. | | Ti = 48.1 | V = 51.4 | Cr = 52.1 | Mn = 55.0 | | | | | | | | | | | | | | | | 5 | Germanium. | Arsenic. | Selenium. | Bromine. | | Ge = 72.3 | As = 75.0 | Se = 79.0 | Br = 79.95 | | | | | | | | | | | | | | | | 6 | Zirconium. | Niobium. |Molybdenum. | —— | | Zr = 90.6 | Nb = 94.0 | Mo = 96.0 | | | | | | | | | | | | | | | | | 7 | Tin. | Antimony. | Tellurium. | Iodine. | | Sn = 119.0 | Sb = 120.0 | Te = 127 | I = 127 | | | | | | 8 | Cerium. | —— | —— | —— | | Ce = 140 | | | | | | | | | 9 | —— | —— | —— | —— | | | | | |