Neco Model Questions Vol1 2017 Chemistry Question 1

Practice essay / theory question 1 from the 2017 Neco Model Questions Vol1 Chemistry examination. This question covers Atomic Structure, Bohr model, Electron configuration .

Neco Model Questions Vol1 2017 Chemistry Essay / Theory

Topics: Atomic Structure Bohr model Electron configuration

Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • essay

The diagram shows a Bohr model of an element X. The nucleus is labelled with an atomic number of 15 and a mass number of 31. The electrons are arranged in three shells: the innermost shell contains 2 electrons, the second shell contains 8 electrons and the outermost shell contains 5 electrons.

Question Parts

( a )

State the name of the element and its chemical symbol.

( b )

Calculate the number of neutrons present in the nucleus of the element.

( c )

Write the ground‑state electron configuration of the element (i) using Bohr notation and (ii) using orbital (Aufbau) notation.

( d )

The element is excited so that one electron from the 3p subshell is promoted to the 4s subshell. (i) Write the new electron configuration. (ii) State qualitatively what happens to the energy of the atom during this transition and explain why such a transition is possible.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Neco Model Questions Vol1 2017 Chemistry Question 1. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure, Bohr model, Electron configuration .

View More Neco Model Questions Vol1 2017 Chemistry Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows

Chat with Support