Give a reason for the following. Ionisation potential increases across a period, from left to right.

Across a period atomic size decreases and nuclear charge increases, hence more energy is required to remove the valence electrons. Therefore, ionisation potential increases. Thus, the ionisation energy decreases from top to bottom in groups and increases from left to right across a period in the periodic table.

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>CHECK POINT 01>Q 4

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What are horizontal rows and vertical columns in Mendeleev’s periodic table known as?

Important Questions on Periodic Properties and Their Variations

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>CHECK POINT 03>Q 5

Why noble gases usually do not react? Explain with the help of electronic configuration.

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>CHAPTER EXERCISE>Q 22

Name an inert gas having two electrons as its valency.

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>CHAPTER EXERCISE>Q 29

Metallic character changes to the non-metallic character as one moves from left to right, is it correct? Explain your answer.

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>CHAPTER EXERCISE>Q 30

What property of an element is measured by electronegativity?

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>CHAPTER EXERCISE>Q 34

Name the following periodic property.
Character of an element which loses one or more electrons when supplied with energy? (Metallic/ Non-metallic)

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>ARCHIVES* (Last 6 Years)>Q 3

In period $3$ of the periodic table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the brackets to complete the following statements.
(i) The element B would have (lower/higher) metallic character than A.

(ii) The element A would probably have (lesser/ higher) electron affinity than B.

(iii) The element A would have (greater/smaller) atomic size than B.

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>ARCHIVES* (Last 6 Years)>Q 9

Identify the term/substance in the following
The tendency of an atom to attract electrons towards itself when combined in a compound.

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All in One - ICSE Chemistry>Chapter 1 - Periodic Properties and Their Variations>ARCHIVES* (Last 6 Years)>Q 14

Give one word or phrase for the following.
The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.