Neco 2018 Chemistry Question 1

Practice essay / theory question 1 from the 2018 Neco Chemistry examination. This question covers Atomic Structure, Electronic Configuration, Periodic Properties .

Neco 2018 Chemistry Essay / Theory
Topics: Atomic Structure Electronic Configuration Periodic Properties
Question 1 NECO • 2018 • CHEMISTRY • essay
Neco 2018 Chemistry Question 1 diagram

The diagram shows the Bohr model of an unknown element X. The nucleus is labelled X and the electron shells contain the following numbers of electrons: K‑shell 2, L‑shell 8, M‑shell 5. No electrons are shown in higher shells.

Question Parts

( a )
Determine the atomic number (Z) of element X and write the symbol of the element (including mass number) if the most abundant isotope of X contains 16 neutrons.
( b )
Write the ground‑state electron configuration of element X using orbital notation (showing the distribution of electrons in s and p subshells).
( c )
Predict the most common ion formed by element X in its compounds and give the formula of the oxide formed with oxygen.

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About This Question

This is Neco 2018 Chemistry Question 1. It is one of the essay questions from the 2018 Neco Chemistry examination.

The question covers Atomic Structure, Electronic Configuration, Periodic Properties .

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