Question

14.The probability density of an electron can be affected by

a) Far atoms b) near atoms c) neighbouratoms

d) none of the above

15.Why the atomic radius decreases along the period from Sc to Mn,

a)Zeff > S.E b) Zeff < S.E c) Zeff=S.E d) None of the above

16.Which one of the following sets of ions represents a collection of

isoelectronic species?

a)K

+

, Cl-

, Ca2+, Sc3+ b) N3-

,O2-

,F-

,S2-

c) Li+

,Na+

,Mg2+,Ca2+



d) Ba2+,Sr2+,K+

,S2-

17.Among the following radius which is the smallest radius

a) Atomic radius b) Vanderwaals radius c) Covalent radius

d) Metallic radius

18.Representative elements are those which belongs to

a) S and d block b) s and p block c) p and d block

d) d and f block

19.The law of triad is applicable to

a)Cl, Br and I b) H2, O2& N2 c) Na, Ne & Ca d) All of the above

20.Which one among the following species has the largest atomic radius

a)Na b) Mg c) Al d) Si

21.What would be the IUPAC name for the element with atomic number

120

a) Bididium b) didibium c) bibibium d) unbinilium

22.Ionic radii vary in

a) Inverse proportional to the effective nuclear charge

b) Inverse proportional to the square of the effective nuclear charge

c) Direct proportional to the screening effect

d) Direct proportional to the square of the screening effect

23.Which of the following atoms is likely to give off more energy on gaining

an electron

a) Na b) Mg c) Al d) Cl

24.Identify the group and period number of the element having an atomic

number 24

a)4,6 b) 5,5 c) 4,5 d) 4,7

25.Calculate the Zeff experienced by one of the 4s2 electrons of Br

a) 7.6 b) 5.45 c) 9.35 d) 7.65​

Answer 1

Answer:

electrons and thus, ionic radii decreases. More screening effect means less effective nuclear charge and thus, larger ionic radii.