OCR Chemistry A – 5.3.1 Required Y12 Content

Number of orbitals in the d-subshell =

TICK ALL THAT APPLY

Which species has an incomplete d-subshell?

• [Ar]3d¹⁰

• [Ar]4s²3d⁵

• [Ar]4s²3d⁸

• [Ar]4s¹3d¹⁰

Two transition elements in the 4th period have atoms with an incomplete 4s-subshell.

Name the one that has the fewest electrons.

Two transition elements in the 4th period have atoms with an incomplete 4s-subshell.

Name the one with the biggest atomic number.

Two transition elements in the 4th period have atoms with an incomplete 4s-subshell

The electron configuration of one ends in 3d10. The other one ends in...

TICK ALL THAT APPLY

Zinc forms the following ions:

• 1+

• 2+

• 3+

• 4+

• none of the above

TICK ALL THAT APPLY

Which species must be an ion?

• [Ar]3d¹⁰

• [Ar]4s²3d⁵

• [Ar]4s²3d⁸

• [Ar]4s¹3d¹⁰

TICK ALL THAT APPLY

"Transition elements" have ions with incomplete d-subshells.

Which of the following are "transition elements".

Check your spec! 5.3.1(b)

• Sc

• Cr

• Fe

• Cu

• Zn

The oxidation number of chromium in [Cr(H₂O)₆]³⁺ is...

TICK ALL THAT APPLY

homogenous catalysts are involved in

• Hydrogenation of alkenes

• Decomposition of hydrogen peroxide with MnO₂(s)

• Industrial synthesis of ammonia (Haber Process)

• break down of the ozone layer due to CFCs