Question

Atomic number of `Ag` is 47. In the same group the atomic numbers of elements placed and below `Ag` in long form of periodic table will be `x` and `y` respectively. Given the value fo `(x+y)//12`.

Answer 1

Atomic number of `Cu` is `29 = x`
Atomic number of `Au` is `79 = y`
`x +y = 108`
`(x+y)/(12) = (108)/(12) = 9`.