Elements of one short period of the periodic table are given below in the order from left to right Na, Mg, AL, P,561, AT
i) To which period of the do these elements belongs?
ii) one element of this period is missing? which is the missing elemend and where it should be placed?
iii)whhich of the above elements belongs to family of Halogens? what is its electro negativity vaule ?
iv) How does metallic character varies in the Period?
Answers
Answer:
(i) These elements belong to 3 rd period.
(ii) Si, S, Cl Ar are missing elements in this period.
The order of elements: Na, Mg, Al, Si, P, S, Cl, Ar
(iii)Cl belongs to the halogen family
The electronegativity value of chlorine is 3.16
(iv)Metallic character decreases from left to right across each Period
Explanation:
The third period contains eight elements: sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, and argon. The first two elements, sodium, and magnesium are in the s-block of the periodic table, while the others are in the p-block.
Metallic character decreases from left to right across each Period of the Table as the outer electrons experience increased effective nuclear charge and hence require more energy to remove.