6 carbon (tàn) 7 nitrogen (dàn) 8 oxygen (yǐ ng) 9 fluorine (fú) 10 neon (nǐ i);

1 1 sodium (nà) 12 magnesium (měi) 13 aluminum (lǐ) 14 silicon (guě) 15 phosphorus (lí n

16 sulfur (liú) 17 chlorine (lǔ) 18 argon (yà) 19 potassium (ji ǐ) 20 calcium (gài).

Cognitive history

Historical origin

The origin of element thought is very early. Babylonians and ancient Egyptians once regarded water (and later air and soil) as the main element of the world, forming the theory of three elements. There were four theories in ancient India and five elements in ancient China.

Elemental theory, that is, the theory that elements are the simplest components of all real objects in nature, has been produced as early as ancient times. But in ancient times, the modern concept that elements were regarded as concrete forms of matter did not exist.

Whether in ancient Chinese philosophy or in ancient Indian or western philosophy, elements are regarded as an abstract and primitive form of expression, or as the basic attributes of matter.

Ancient Greek natural philosophy put forward the famous four-element theory. This is not created by Greek philosophers. The four-element theory exists in the traditional folk beliefs of ancient Greece, but it is not supported by a (relatively speaking) solid theoretical system. Ancient Greek philosophers "borrowed" the concepts of these elements as their essence.

Baidu encyclopedia-chemical elements