The chemical composition of table salt is sodium chloride, which contains chloride ions and sodium ions. Six sodium ions are connected in the left, right, up, down, front and back directions of each chloride ion. Similarly, six chloride ions are also connected in the six directions of each sodium ion. Countless ions are stacked together to form cubic table salt. Why is the shape of table salt cubic? Table salt refers to sea salt, well salt, mineral salt, lake salt, soil salt, etc. from different sources, including barium salt, chloride, magnesium, zinc and other impurities.
Salt has a wide range of functions, such as sterilization, tooth protection, skin cleaning, decontamination, important chemical raw materials, edible, etc.
Salt in ancient China was boiled with sea water. Salt originated in the Yan and Huang dynasties 5000 years ago. （ShiYanDeWaiXingWeiShenMeShiLiFangTi）