Which of the following transition metal ions has the lowest density?

(a) Copper

(b) Nickel

(c) Scandium

(d) Zinc

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. 3^rd

2. 15^th

3. 17^th

4. 12^th

General electronic configuration of the transition elements is given by:

(1) ns²nd^1-10

(2) ns²np⁶nd^1-10

(3) (n-1)d^1-10np⁶

(4) (n-1)${\mathrm{d}}^{1-10}$n$s^{1-2}$

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