Complete the following crossword puzzle (Fig. 3.1) by using the name of the chemical elements. Use the data given in Table 3.2. Table 3.2 Across Down 2. The element used by Rutherford 1. A white lustrous metal used for during his α–scattering making ornaments and which experiment tends to get tarnished black in 3. An element which forms rust on the presence of moist air exposure to moist air 4. Both brass and bronze are alloys 5. A very reactive non–metal stored of the element under water 6. The metal which exists in the 7. Zinc metal when treated with liquid state at room temperature dilute hydrochloric acid 8. An element with symbol Pb produces a gas of this element which when tested with burning splinter produces a pop sound. Fig. 3.1
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46 (a) (b) Six : Helium (He); Neon ( Ne); Argon (Ar); Krypton (Kr); Xenon (Xe); Radon (Rn).