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
Wedding reception of a couple's entire wedding budget is spent on the reception alone. This is primarily due to the cost of food and alcohol. Wedding traditions vary between countries, and between regions of the same country. Some traditions include: Unless the wedding couple has a wedding registry, it is best not to give gifts or gift certificates. For Chinese weddings, cash or a cheque is always the best gift. In addition to that, some elder relatives might also give gold jewelry. The cash or cheque should be in a red envelope or red pocket with the givers' names on it, and