All the elements in a particular group have the same ________.
Same mass number
Same number of shells
Same number of valence electrons
Different number of valence electrons
Since elements in a group have similar chemical properties, their electronic arrangement and consequently the number of valence electrons are same.
Name or state the following :
(a) An element having valency zero.
(b) Metal with valency one.
(c) Atoms of the same element differing in mass numbers.
(d) Elements having same mass number but different atomic number.
(e) Bond formed by transfer of electron(s).
(f) Ion formed by gain of electron(s).
Assertion: Elements present in the group show same valency.
Reason: Elements present in a group have same number of electrons in the valence shells of their atoms.
Mark the correct choice as