Question

Two elements with symbol X (atomic no. 11) and Y (atomic no. 13) are placed in the III period of the modern periodic table - (i) Which amongst the two has more metallic character? (ii) Calculate the valency of each element. (iii) Element ‘Y’ is smaller than ‘X’ in terms of atomic size. Is the statement true, justify?

Answer 1

i) X
ii) X- +1
Y- +3
iii) True, as atomic size decreases across a period and X comes before Y