Neco 2022 Chemistry Question 1

Practice essay / theory question 1 from the 2022 Neco Chemistry examination. This question covers Atomic Structure .

Neco 2022 Chemistry Essay / Theory

Topic: Atomic Structure

Question 1 NECO • 2022 • CHEMISTRY • essay

The diagram shows a simplified Bohr model of an unknown element X. The nucleus contains 15 protons and 16 neutrons. The electron shells are labelled K, L and M and contain 2, 8 and 5 electrons respectively.

( a )

Identify the element and write its chemical symbol.

( b )

State the atomic number, mass number and the number of neutrons of the element.

( c )

Write the ground‑state electron configuration of the neutral atom using the notation 1s² 2s² 2p⁶ 3s² 3pⁿ.

( d )

If the atom loses two electrons to form a cation, write the new electron configuration and state the charge of the ion.

( e )

Calculate the percentage by mass of neutrons in the nucleus of the element (use 1 u for the mass of a proton and a neutron, neglect electron mass).

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This is Neco 2022 Chemistry Question 1. It is one of the essay questions from the 2022 Neco Chemistry examination.

The question covers Atomic Structure .

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