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 Ã¢ÂÂYÃ¢ÂÂ is smaller than Ã¢ÂÂXÃ¢ÂÂ in terms of atomic size. Is the statement true, justify?
i) X has a more metallic character as metallic character decreases as we go from left to right in a period.
ii) Valency of X= +1
Valency of Y= +3
iii) The statement is true. As we move from left to right along a period the atomic size decreases. This is because of higher number of protons in the nucleus which leads to a higher force of attraction between the nucleus and electrons,