Neco 2021 Chemistry Question 2

Practice practical question 2 from the 2021 Neco Chemistry examination. This question covers Periodic Table .

Neco 2021 Chemistry Practical
Topic: Periodic Table
Question 2 NECO • 2021 • CHEMISTRY • practical

The following data were obtained from a series of measurements on the elements of the second period of the periodic table. The atomic radius (in pm) and first ionisation energy (IE, in kJ·mol⁻¹) are given:\n\n| Element | Atomic radius (pm) | First IE (kJ·mol⁻¹) |\n|---------|-------------------|----------------------|\n| Na | 186 | 496 |\n| Mg | 160 | 738 |\n| Al | 143 | 578 |\n| Si | 118 | 787 |\n| P | 110 | 1012 |\n| S | 104 | 1000 |\n| Cl | 99 | 1251 |\n| Ar | 71 | 1521 |\n\nUsing this information, answer the questions that follow:

Question Parts

( a )
Identify the element with the highest first ionisation energy and calculate the percentage increase in ionisation energy from Na to that element. Give your answer to one decimal place.
( b )
Assuming a linear decrease of atomic radius across the period, estimate the atomic radius of potassium (K), the first element of the next period, by extrapolating the trend from Na (186 pm) to Ar (71 pm). Round your answer to the nearest pm.
( c )
Provide two scientific explanations for the observed decrease in atomic radius from Na to Ar across the period.

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About This Question

This is Neco 2021 Chemistry Question 2. It is one of the practical questions from the 2021 Neco Chemistry examination.

The question covers Periodic Table .

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