Question

Two elements with symbol X (atomic number 11) and Y (atomic number 13) are

placed in the III period of the modern periodic table.

(1) Which among the two has more metallic character.
(2) Calculate the valency of each element.

(3) Element y is smaller than x in terms of atomic size. It this statement true,

justify?​

Answer 1

X- Na
Y- Al

(1) Na has the most metallic character because the metallic nature increases from right to left along the period.
(2) valency of Na- +1
Valency of Al- +4/-4
(3) yes, because atomic size/radius decreases from left to right in the period.

Answer 2

Answer:

Please refer to the image for answer.

Thanks