Choose the statement that defines transition elements correctly.

• A transition element is one that forms cations with a completely filled d-subshell of electrons

• A transition element is one that forms at least one compound with a partially filled d-subshell of electrons

• A transition element is one that can speed up then the rate of chemical reactions in industrial processes

• A transition element is one whose compounds dissolve in water to form aqueous solutions which are colored

Predict the characteristic of transition metal elements Ti to Cu of atomic number 22 to 29.

• Good electrical and heat conductor

• Have a uniform decrease in atomic radius

• Have two electrons in the 4s orbital

• Have lower first ionization energy than the alkali metals

Indicate electron configuration of Mn³⁺ ion. (Mn = 25)

• [Ar]4s² 3d¹⁰

• [Ar]4s² 3d²

• [Ar]3d⁵

• [Ar]3d⁴

The total number of electrons in the 3d orbital of Ti³⁺ is (Given Ti = 22)

• 1

• 2

• 3

• 4

Select the element that forms a colorless compound with the oxidation state of +4

• Ti

• V

• Cr

• Mn

Identify which of the following ions are most likely to form coloured compounds

• Sc³⁺

• Cu⁺

• Zn²⁺

• Cr³⁺

The ground state electronic configuration of Cr is

• [Ar] 4s¹ 3d⁵

• [Ar] 4s² 3d⁴

• [Ar] 3d⁴

• [Ar] 4s¹ 3d³

Choose the correct electron configuration for cobalt. (Co = 27)

• [Ar]4s² 3d⁶

• [Ar]4s² 3d⁷

• [Ar]4s² 3d⁵

• [Ar]4s² 3d⁴

Identify which of the following are paramagnetic

• Ni²⁺

• V⁵⁺

• Ti⁴⁺

• Mn⁷⁺

Which of the following element is not transition metal?

• Copper

• Iron

• Zinc

• Manganese