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periodic table
Non-metallic properties
There are different ways through which elements can be . The most common in by looking at their properties as well as the number of protons and neutrons that they have.
No, Properties of compounds are totally diffident from that of their constituent elements. For example the property of common salt (sodium chloride) is no way related to either the properties of sodium metal and chlorine gas.
Elements having properties of both non-metals and metals are called Metalliods. Examples are boron, germanium, arsenic, silicon, antimony, etc.
Elements in the same group have similar properties because they have the same number of electrons in their outermost shell
Elements in a given column have the same number of valence electrons and hence the similar properties.
The elements in same column have equal number of valence electrons. They have similar chemical properties.
In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
Valence shell configuration and physical and chemical properties.
All elements have same number of valence electrons (two) and hence they have similar reactivity and chemical properties.
All halogens are very reactive chemical elements anf form anions.