Tin bent, a crackling sound known as the "tin cry" can be heard from the twinning of the crystals. Tin melts at low temperatures of about , the lowest in group 14. The melting point is further lowered to for 11 nm particles. β-tin (the metallic form, or white tin, BCT structure), which is stable at and above room temperature, is malleable. In contrast, α-tin (nonmetallic form, or gray tin), which is stable below , is brittle. α-tin has a diamond cubic crystal structure, similar to diamond, silicon or germanium. α-tin has no metallic properties at all because its atoms form
Chinese pre-wedding customs food, such as peanuts and dates (in Chinese, the word for "date" is a near homonym of "early", while "peanut" is "birth"). This is normally presented on the wedding day, with the wishes of giving birth to a child early in the marriage. Candles and paper cut "Double Happiness" are often seen on a wedding day as well. The bride price, which is given by the groom's family to the bride's family, varies from region to region. In Southern China, the bride price is much higher than in Northern China. After the betrothal gifts and bride price are negotiated and