P-1 Periodic Classification of Element — Science STD 10 — Question

Name of the element	Symbol	Atomic Number	Electronic Configuration
			K	L	M
Beryllium	Be	4	2	2
Carbon	C	6	2	4
Oxygen	O	8	2	6
Boron	B	5	2	3
Aluminium	A1	13	2	8	3

Tendency of atoms of an element to lose electrons and form positive ion, cation is known as electropositivity. These elements lose valence electrons to form cations having a stable noble gas configuration. It is the metallic character of that element. Electropositivity decreases as we move from left to right in a period. Among the elements given, Beryllium, carbon, oxygen and Boron belong to the second period. As Beryllium is the left most element, it will show high electropositive characteristic. Therefore, Beryllium is the most electropositive element.