What is wrong with the following electron configuration:

1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^10, 4s^2?

• The 4s orbital is lower energy than the 3d orbital, so it fills first and therefore should be listed first.

• The p orbital can only hold 4 electrons.

• The highest energy orbital is always listed first.

• Electron numbers should be written as subscripts, not superscripts.

What information is necessary for writing electron configurations?

• All of the orbitals occupied by electrons, and the number of electrons in each.

• The mass of the element.

• The nuclear stability of the element.

• The spin of the electrons.

What is the maximum number of electrons that can be found in a 5p cluster (or orbital) of a single atom?

ركز ي حبيبي

• 2

• 5

• 6

• 14

Which block is manganese (Mn) located in?

• d-block

• f-block

• p-block

• s-block

Element having electronic configuration

1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p3

belongs to the group in the periodic table:

• 3rd A group

• 2nd A group

• 5th A group

• 7th A group

The electronic configuration of

Cr³⁺is:

• [Ar]3d⁴4s²

• [Ar]3d³4s⁰

• [Ar]3d²4s¹

• [Ar]3d⁵4s¹

Which of the following has the electronic configuration [Ar] 3d5?

• Cr

• Fe³⁺

• Mn

• V

Which element is represented by the following electronic configuration ?

• Fluorine

• Neon

• Nitrogen

• Oxygen

Determine the oxidation for the phosorprus atom: HPO₄^2-.

• +4

• +5

• +3

• +2

The oxidation number of C in CO2 is :

• +2

• +1

• +3

• +4