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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