33, arsenic, As, a common poison now used in circuits, 34, selenium, Se, used in many light-sensing applications like photocopiers and light meters, 35, bromine, Br, liquid at room temp but evaporates rapidly into a purple-brown gas, 36, krypton, Kr, inert but glows pale mauve when exposed to high voltage electrical currents, 37, rubidium, Rb, commonly used in cheaper atomic clocks (as a substitute for cesium), 38, strontium, Sr, used in safe glow-in-the-dark paint, 39, yttrium, Y, used in phosphors of CRT TVs, 40, zirconium, Zr, important in the nuclear industry but also used in jewlery

Periodic Table 33-40

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