Question

The statements that is/are true for the long form of the periodic table is/are

• A. it reflects the sequence of filling the electrons in the order of sub-energy level s, p, d and f
• B. it helps to predict the stable valency states of the elements
• C. it reflects tends in physical and chemical properties of the elements
• D. it helps to predict the relative ionicity of the bond between any two element

Answer 1

Answer: (B), (C), (D)

(a) Incorrect Electrons are not filled in sub-energy levels s, p, d and / in the same sequence.
(b) Correct Number of valence shell electrons usually determine the stable valency state of an element.
(c) Correct Physical and chemical properties of elements are periodic function of atomic number which is the basis of modem, long form of periodic table
(d) Correct Relative ionicity of the bond between any two elements is function of electronegativity difference of the bonded atoms which in turn has periodic trend in long form of periodic table.