at. no. 50, atomic wt. 118.70, metal, row 6, col. 4A, val. 2-4, orbits 2-8-18-18-4

{Merck Index - © 1952 by Merck & Co., Inc.}

Tin. Sn; at. wt. 118.70; at. no. 50; valence 2-4.

The metal of commerce is about 99.8% pure.

Almost silver-white, lustrous, soft, very malleable and ductile metal; only slightly tenacious; easily powdered. When being bent, emits the crackling "tin cry." Brittle at 200°. At –40° crumbles to gray amorphous powder ("gray tin"), slowly changing back above 20° to white tin. Available in the form of bars, foil, powder, shot, etc. Stable in air, but when in powder form it oxidizes, especially in presence of moisture. d. 7.31; m. 231.9°; b. 2260°. Slowly soluble in cold dil. HCl or dil. HNO3, hot dil. H2SO4; readily dissolved by concentr. HCl, aqua regia; very slowly attacked by acetic acid; slowly soluble in cold, more readily in hot caustic alkali; concentr. HNO3 converts it into insoluble metastannic acid.

Use: Chiefly for tin-plating, soldering alloys, manuf. tin salts.

Grades available: Reagent.

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