Neco Model Questions Vol1 2021 Chemistry Question 2

Practice essay / theory question 2 from the 2021 Neco Model Questions Vol1 Chemistry examination. This question covers periodic table, electron configuration, oxidation states, d‑block chemistry, colour of transition‑metal ions .

Neco Model Questions Vol1 2021 Chemistry Essay / Theory
Topics: periodic table electron configuration oxidation states d‑block chemistry colour of transition‑metal ions
Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay
Neco Model Questions Vol1 2021 Chemistry Question 2 diagram

The diagram shows a Bohr model of a neutral atom of an element that belongs to the d‑block of the periodic table. The nucleus is labelled with the number of protons (Z) and neutrons (N). Four electron shells are shown and labelled K, L, M and N with the number of electrons on each shell indicated.

Question Parts

( a )
Identify the element shown in the diagram. State its name, chemical symbol and atomic number.
( b )
Write the ground‑state electron configuration of the element (i) in full notation and (ii) in abbreviated notation using the appropriate noble‑gas core.
( c )
The element commonly exhibits two oxidation states, +2 and +4. (i) Write the electron configuration of the ion in each oxidation state. (ii) Explain, with reference to the order of electron removal, why the configurations are as obtained.
( ) Write the electron configuration of Ti²⁺.
( ) Write the electron configuration of Ti⁴⁺.
( ) Explain why the electrons are removed in that order.
( d )
Aqueous solutions of Ti³⁺ ions are violet whereas Ti⁴⁺ ions are colourless. Explain this observation in terms of d‑electron transitions and crystal‑field theory.

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About This Question

This is Neco Model Questions Vol1 2021 Chemistry Question 2. It is one of the essay questions from the 2021 Neco Model Questions Vol1 Chemistry examination.

The question covers periodic table, electron configuration, oxidation states, d‑block chemistry, colour of transition‑metal ions .

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