Question

Which is the most metallic Element of ${2^{nd}}$ period.

Answer 1

A metal has a lustrous appearance and it conducts electricity and heat. Metals are malleable that means it can be beaten into thin sheets and also metal are ductile which means wires can be drawn from the metals. Metals are electropositive because of their ability to lose electrons in order to form positively charged ions.

Complete answer:
Second period elements are lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon.
Carbon, nitrogen, boron, oxygen and fluorine are non-metal. Lithium and beryllium are metals. Metallic character decreases on moving across a period from left to right.
The effective nuclear charge acting on the valence shell electrons increases so the tendency to lose electrons decreases in the periodic table on moving from left to right across the period, electrons get added to the same shell because of this addition of electrons the nucleus attracts the electrons more strongly so the greater effective nuclear charge is experienced by the nucleus. The energy required to remove the outermost electron will be high and the metallic character is defined by the ability of the atom to lose its outermost electron.
Electronegativity is inversely proportional to the metallic properties of elements. The attraction between the outer electron and nuclear increases because atomic radius decreases in a period.
So, the most metallic Element of the ${2^{nd}}$ period is lithium.

Note:
Lithium is a soft, silvery white alkali metal and it has a single valence electron which is easily given up to form a cation.
Lithium-aluminium alloy has high tensile strength and elasticity, it is used for aircraft construction. Lithium is also used to make both the primary and secondary batteries.