Ionic radii are :
(1) Inversely proportional to effective nuclear charge.
(2) Inversely proportional to square of effective nuclear charge.
(3) Directly proportional to effective nuclear charge.
(4) Directly proportional to square of effective nuclear charge.
Which one is a metalloid?
(1)Tin
(2)Germanium
(3)Sulphur
(4)Carbon
Elements with electronic configuration 1s2,2s22p6, 3s23p63d10, 4s24p64d10, 5s25p3 belongs to the ...... group of periodic table.
1. 3rd
2. 15th
3. 17th
4. 12th
General electronic configuration of the transition elements is given by:
(1) ns2nd1-10
(2) ns2np6nd1-10
(3) (n-1)d1-10np6
(4) (n-1)n
Which of the following is not a metal?
(1) Gold
(2) mercury
(3) Scandium
(4) Selenium
The alkali metals have:
1. Highest ionization energy
2. Largest atomic radii
3. Highest density
4. Highest electronegativity
Which of the following statement is correct with respect to the property of elements with increase in atomic number in carbon family.
(1) Their metallic character decreases
(2) The stability of +2 oxidation state increases
(3) Their ionisation energy increases
(4) Their atomic size decreases
The graph of first ionization enthalpy versus atomic number as follows:
Which of the following statement is correct?
(1) Alkali metals are at the maxima and noble gases at the minima.
(2) Noble gases are at the maxima and alkali metals at the minima.
(3) Transition element are at the maxima.
(4) Minima and Maxima do not show any regular behaviour.
The electronic configuration of chalcogens in their outermost orbit is:
1. ns2,np3
2. ns2,np4
3. ns2,np5
4. ns2,np2
Match list-I with list II and select the correct answer using codes given below:
1. List-I Ions List-II Radius (in pm)
(I) Li+ (a) 216
(II) Na+ (b) 195
(III) Br- (c) 60
(IV) I- (d) 95
Codes:
I II III IV
1. a b d c
2. b c a d
3. c d b a
4. d c b a