An element of group `18` has total `s`, `p` and `d` electrons equal to `x`, `y` and `z` respectively. If `x+z=y`, then period number of element is

If the 4th, 10th and 16th terms of a G.P. are x,y and z respectively, then x,y,z are in

An element 'X' has its electronic configuration of 'K' shell is (n-5)s^(2) and it has total number of electrons in its outermost, penultimate and antipenultimate shell are 2,8 and 25 respectively then find out total number of unpaired electrons in element 'X' in their ground state.

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : forms an anion

Three elements 'X', 'Y' and 'Z' have atomic numbers 18, 19 and 20 respectively. How many electrons are present in the M shell of these elements?

Three elements X , Y and Z have atomic numbers 19 , 37 and 55 respectively . Then the correct statement (s) is / are

A compound contains three elements X, Y and Z. The oxidation number of X, Y and Z are +3, +5 and -2 respectively. The possible formula of the compound is

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : forms a cation

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : has four electrons in the valency shell ?

For boron family (B,Al,Ga,In and Tl) x : Number of elements which are solid at 40^(@) y : period number of element which has greater ionization energy than element just above and below it in periodic table. Z : Period number of most abundant element of group 13 . Report your answer x+2y+3z

In group 1 of the periodic table three elements X, Y and Z have atomic radii 133 pm, 95 pm and 65 pm respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.