Which of the following can be represented by the configuration [Kr] 5s²?

• Ca

• Sr

• Ba

• Ra

Out of the following electronic configurations the one of a transition element, is

• 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p⁶

• 1s², 2s² 2p⁶, 3s² 3p⁶ 3d³, 4s²

• 1s², 2s² 2p⁶, 3s² 3p⁶, 4s²

• 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s² 4p¹

The element with atomic number 55 belongs to which block of the periodic table?

• s-block

• p-block

• d-block

• f-block

Which of the following has largest size?

• Al

• Al⁺

• Al²⁺

• Al³⁺

To which block is related an element having electronic configuration 1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰, 4s¹ in the periodic table?

• s-block

• p-block

• d-block

• f-block

The electronic configuration of an element is 1s², 2s², 2p⁶, 3s² 3p⁶, 3d¹⁰, 4s² 4p³. Its properties would be similar to which of the following elements?

• Boron

• Oxygen

• Nitrogen

• Chlorine

The number of unpaired electrons in Fe³⁺ (Z = 26 ) is

• 4

• 5

• 6

• 3

108.

Outermost configuration for Z = 25, is

• 4s², 3d⁵

• 5s², 4d⁵

• 4s², 3d³

• 4s², 3d¹

Which is responsible for the diagonal relation of lithium with magnesium?

• Less ionic radii

• High polarising power

• Approximately equal electronegativity and affinity

• All of the above

In the modern periodic table the place of the element with atomic number 31 is in

• s- block

• d-block

• p- block

• f- block