Gce Model Questions Vol1 2021 Chemistry Question 1

Practice essay / theory question 1 from the 2021 Gce Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Gce Model Questions Vol1 2021 Chemistry Essay / Theory

Topic: Atomic Structure

Question 1 GCE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay

Gce Model Questions Vol1 2021 Chemistry Question 1 diagram

The diagram shows a neutral atom of an unknown element. The nucleus contains 15 protons and 16 neutrons. The electron shells are labelled and the number of electrons in each shell is shown: first shell – 2 electrons, second shell – 8 electrons, third shell – 5 electrons.

Question Parts

( a )

Identify the element and write its symbol.

( b )

Calculate the mass number of the atom and give the standard notation for the isotope shown.

( c )

Write the ground‑state electron configuration of the element using the Aufbau principle and indicate the number of valence electrons.

( d )

Explain why this element commonly forms a –3 ion in its compounds.

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About This Question

This is Gce Model Questions Vol1 2021 Chemistry Question 1. It is one of the essay questions from the 2021 Gce Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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