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 The Periodic Table: 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 first ionisation energy decreases.

Explanation:

Ionisation Energy: The ionisation energy is the energy required to remove an electron from an atom in the gaseous state. As you go down the group, the outermost electrons are farther from the nucleus and are shielded by inner electron shells, making them easier to remove. Hence, ionisation energy decreases.
Electronegativity: Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. As you move down the group, the electronegativity also decreases due to the increased distance of the valence electrons from the nucleus, resulting in a weaker attraction for the bonding electrons.

Thus, the correct answer is A.

Step 2

B. decreases and the electronegativity increases.

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Answer

This option is incorrect as both ionisation energy and electronegativity decrease as you move down the group.

Step 3

C. increases and the electronegativity decreases.

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Answer

This option is also incorrect because the ionisation energy does not increase while going down Group 1.

Step 4

D. increases and the electronegativity increases.

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Answer

This is incorrect as ionisation energy decreases and electronegativity decreases when moving down the group.

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.

Explanation:

B. decreases and the electronegativity increases.

C. increases and the electronegativity decreases.

D. increases and the electronegativity increases.

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