Neco 2018 Chemistry Question 2

Practice essay / theory question 2 from the 2018 Neco Chemistry examination. This question covers Periodic Table, Periodic Trends, Chemical Bonding .

Neco 2018 Chemistry Essay / Theory

Topics: Periodic Table Periodic Trends Chemical Bonding

Question 2 NECO • 2018 • CHEMISTRY • essay

The diagram shows a portion of the periodic table highlighting periods 2 and 3 and groups 1, 2, 13, 14, 15, 16 and 18. The element Y is placed in period 3, group 16. The data given for Y are: atomic radius = 70 pm, first ionisation energy = 999 kJ·mol⁻¹, electronegativity (Pauling) = 2.5. For the element in the same period but group 2 (element Z) the atomic radius is 150 pm and its first ionisation energy is 738 kJ·mol⁻¹.

Question Parts

( a )

Identify element Y by its chemical symbol and name.

( b )

Explain why the atomic radius of Y is smaller than that of Z even though both are in the same period.

( c )

Write the chemical formula of the most stable oxide formed by element Y and state the oxidation state of Y in that oxide.

( d )

Calculate the percentage decrease in atomic radius from element Z to element Y. Show your working.

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About This Question

This is Neco 2018 Chemistry Question 2. It is one of the essay questions from the 2018 Neco Chemistry examination.

The question covers Periodic Table, Periodic Trends, Chemical Bonding .

View More Neco 2018 Chemistry Questions More Neco Practice Questions Back to Questions

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