Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

1. ns and np orbits

2. (n-1)d and ns orbits

3. (n-1)d orbits

4. ns orbits

 

The outer electronic configuration of Gd (Atomic no. 64) is:

1. 4f³ 5d⁵6d²

2. 4f⁸ 5d¹⁰6d²

3. 4f⁴ 5d⁴6d²

4. 4f⁷ 5d¹6s²

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

1. Copper

2. Nickel

3. Scandium

4. Zinc

Which one is a metalloid?

1. Tin

2. Germanium

3. Sulphur

4. Carbon

Elements with an electronic configuration 1s² 2s²2p⁶  3s²3p⁶3d¹⁰ 4s²4p⁶4d¹⁰ 5s²5p³ belong to the group :

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)d^1-10ns^1-2

Which among the following options is a nonmetal?

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 the 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.