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Trends in the Periodic Table MCQ3

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Questions and Answers

What is the primary reason for the decrease in atomic radius across a period?

Decreased atomic mass

Increased screening effect

Increased nuclear charge (correct)

Increased number of energy levels

What is the main reason for the increase in electronegativity across a period?

Decreased screening effect

Increased number of energy levels

Increased nuclear charge (correct)

Increased atomic radius

What is the primary reason for the decrease in 1st ionisation energy down a group?

Decreased number of energy levels

Increased nuclear charge

Decreased screening effect

Increased atomic radius (correct)

What is the main reason for the increase in atomic radius down a group?

Increased number of energy levels (C) Signup and view all the answers

What is the definition of the 2nd ionisation energy of an element?

The minimum amount of energy required to remove the most loosely bound electron from each singly charged positive ion in a mole of these ions (C) Signup and view all the answers

What is the trend in atomic radius across a period?

Decreases (D) Signup and view all the answers

What is the trend in electronegativity down a group?

Decreases (A) Signup and view all the answers

What is the definition of the 1st ionisation energy of an element?

The minimum amount of energy required to remove the most loosely bound electron from 1 mole of gaseous atoms in their ground state (B) Signup and view all the answers

What is the relationship between the atomic radius of an element and the distance between the nuclei of two atoms of the element joined by a single covalent bond?

The atomic radius is half the distance between the nuclei. (C) Signup and view all the answers

What is the primary reason for the decrease in atomic radius across a period, aside from increased nuclear charge?

The same screening effect (D) Signup and view all the answers

Which of the following statements is true about electronegativity across a period?

Electronegativity increases due to increased nuclear charge and smaller atomic radius. (A) Signup and view all the answers

What is the primary reason for the decrease in electronegativity down a group?

Increased atomic radius and screening effect (B) Signup and view all the answers

What is the relationship between the 1st ionisation energy and atomic radius across a period?

1st ionisation energy increases with decreased atomic radius. (C) Signup and view all the answers