Three elements X, Y and Z belong to 17th group but to 2nd, 3rd and 4th period respectively. Number of valence electrons in Y is 7. Find the number of valence electrons in X and Z.

Three elements X, Y and Z belong to 17^(th) group but 2^(nd),3^(rd)and4^(th) period respectively. Number of valence electrons in Y is 7. Find the number of valence electrons in X and Z.

The number of valency electrons in carbon atom (Z=6) is

The number of valence electrons present in the 12th element of any period is

For elements ""_19^39X Number of valence electrons

An element belongs to group 17 and period 3 of the periodic table. Write the following: The number of valence electrons in its atom.

An element X belongs to 3rd period and group II of the periodic table . State : the number of valence electrons.

An element with atomic number 5 belongs to III A group of the modern periodic table. Find the number of valence electrons