If Z=3, what would be the valency of the element? Also, name the element.
Given: Atomic number, Z = 3
The electronic configuration of the element = K-2; L-1, hence its valency = 1
The element with atomic number 3 is Lithium.
Complete the following table
Which one of the following is a correct electronic configuration of Sodium?
(a) 2, 8
(b) 8, 2, 1
(c) 2, 1, 8
(d) 2, 8, 1
Number of valence electrons in Cl– ion are:
Isotopes of an element have
(a) The same physical properties
(b) Different chemical properties
(c) Different number of neutrons
(d) Different atomic numbers.
Rutherford’s alpha – particle scattering experiment was responsible for the discovery of
(a) Atomic nucleus