As you move down the elements of Group 1 of the periodic table, the first ionisation energy A. decreases and the electronegativity decreases. B. decreases and the electronegativity increases. C. increases and the electronegativity decreases. D. increases and the electronegativity increases.

SSCE VCE Chemistry Chemical Elements: As you move down the elements of

As you move down the elements of Group 1 of the periodic table, the first ionisation energy A - VCE - SSCE Chemistry - Question 3 - 2002 - Paper 1

Question 3

As you move down the elements of Group 1 of the periodic table, the first ionisation energy A. decreases and the electronegativity decreases. B. decreases and the el... show full transcript

Worked Solution & Example Answer:As you move down the elements of Group 1 of the periodic table, the first ionisation energy A - VCE - SSCE Chemistry - Question 3 - 2002 - Paper 1

Step 1

A. decreases and the electronegativity decreases.

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Answer

As you move down Group 1 of the periodic table, the atomic radius increases due to the addition of electron shells. This increase in distance between the nucleus and the outermost electron leads to a weaker electrostatic attraction, thereby decreasing the first ionisation energy.

Additionally, as the atomic size increases, the ability of the nucleus to attract the surrounding electrons decreases, which results in a decrease in electronegativity. Therefore, this option correctly describes the trends in both ionisation energy and electronegativity.

As you move down the elements of Group 1 of the periodic table, the first ionisation energy A - VCE - SSCE Chemistry - Question 3 - 2002 - Paper 1

Worked Solution & Example Answer:As you move down the elements of Group 1 of the periodic table, the first ionisation energy A - VCE - SSCE Chemistry - Question 3 - 2002 - Paper 1

A. decreases and the electronegativity decreases.

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