Question

The atomic number of two elements a and b are 19 and 20 respectively which element exhibits highest metalic property? Why ?Write the molecular formula of the componed formet when these elements combine with the elements x having atomic number 17

Answer 1

As a has atomic number 19 so it has electronic configuration 2,8,8,1 and b has atomic number  20 so it has electronic configuration 2,8,8,2

A has more metallic property because of less electrons in its outermost shell and metallic period decreases along a period from left to right and element a is placed left to element b .

molecular formula between a and x will be ax since a is a metal whereas x is a non metal and in molecular formula metal is placed first