topic: Arrangements of elements in the periodic table. Sub topic: Valency, type (metal/ non- metal/ metalloids/ inert gases), Chemical properties etc.
Answers
Arrangement of elements-
The elements in the periodic table are arranged on the basis of their atomic number because it have much greater effects on properties of element than other factors
Electronic configuration is influenced by atomic no and show regular variations with atomic no (Some exceptions of higher elements are their . Elements with similar chemical properties and physical( result of electronic configuration are arranged in a vertical array. Also elements with same outer shell are in a horizontal period they also show regular variation for a large region(Exceptions are also there which result from different factors like size , exchange energy orientations of orbitals and other electrons
Metals:
Majority elements in the periodic table are metals. This includes transition metals, lanthanides, actinides and alkaline earth metals. Metals are separated by nonmetals on a periodic table through a zigzag line starting from carbon, till radon.
Non-Metals:
Very few elements in the periodic table are non-metals. These are present on the right-hand side in the periodic table. Elements that come under non-metals are Sulphur, carbon, all halogens, phosphorus, hydrogen, oxygen, selenium, nitrogen and noble gases.
Valency
Valency is the combining capacity of a radical or an element. There are two types of valency : Electrovalency and covalency.
Inert Gases
Inert gases are also known as noble gases. An inert gas is a gas that does not undergo chemical reactions under a set of given conditions.