Neco Model Questions Vol1 2021 Chemistry Question 1

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

Neco Model Questions Vol1 2021 Chemistry Essay / Theory
Topic: Atomic Structure
Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay
Neco Model Questions Vol1 2021 Chemistry Question 1 diagram

The diagram shows a lithium atom (Z = 3) with its nucleus and electron shells labelled as in the illustration.

Question Parts

( a )
State the number of protons, neutrons and electrons present in a neutral lithium atom.
( b )
Write the ground‑state electron configuration of lithium using (i) the full notation and (ii) the abbreviated noble‑gas notation.
( c )
Natural lithium consists of two isotopes: ⁶Li (7.5 % abundance, atomic mass 6.015 u) and ⁷Li (92.5 % abundance, atomic mass 7.016 u). Calculate the average atomic mass of lithium to three decimal places.

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About This Question

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

The question covers Atomic Structure .

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