Home
Class 10
CHEMISTRY
Assertion: Number of valence electrons i...

Assertion: Number of valence electrons increases down a group.
Reason: More electrons are added in valence shell as we move from right to left in a period.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given statements, we will break down the assertion and the reason step by step. ### Step 1: Understand the Assertion **Assertion:** The number of valence electrons increases down a group. - **Explanation:** In the periodic table, elements are arranged in groups (columns) and periods (rows). As you move down a group, the elements have the same number of valence electrons. For example, all elements in Group 1 (like Lithium, Sodium, Potassium) have 1 valence electron. Therefore, the assertion that the number of valence electrons increases down a group is **false**. ### Step 2: Understand the Reason **Reason:** More electrons are added in the valence shell as we move from right to left in a period. - **Explanation:** In the periodic table, as you move from left to right across a period, the number of valence electrons increases. For example, in the second period, Lithium has 1 valence electron, Beryllium has 2, and so on, up to Neon which has 8 valence electrons. Conversely, moving from right to left decreases the number of valence electrons. Therefore, the reason is also **false**. ### Step 3: Conclusion Both the assertion and the reason are false. Thus, the correct answer is that both the assertion and the reason are false. ### Final Answer: Both the assertion and the reason are false. ---
To analyze the given statements, we will break down the assertion and the reason step by step. ### Step 1: Understand the Assertion **Assertion:** The number of valence electrons increases down a group. - **Explanation:** In the periodic table, elements are arranged in groups (columns) and periods (rows). As you move down a group, the elements have the same number of valence electrons. For example, all elements in Group 1 (like Lithium, Sodium, Potassium) have 1 valence electron. Therefore, the assertion that the number of valence electrons increases down a group is **false**. ### Step 2: Understand the Reason ...
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    MTG IIT JEE FOUNDATION|Exercise Exercise (Comprehension Type)|14 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    MTG IIT JEE FOUNDATION|Exercise Exercise (Subjective Problems Very Short Answer Type)|26 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    MTG IIT JEE FOUNDATION|Exercise Exercise (Match the following)|3 Videos

  • MOLE CONCEPT, STOICHIOMETRY AND BEHAVIOUR OF GASES

    MTG IIT JEE FOUNDATION|Exercise EXERCISE (INTEGER/NUMERICAL VALUE TYPE) |5 Videos

Similar Questions

Explore conceptually related problems

The number of valence electrons increases down a group of the periodic table.

Assertion: Shielding effect increases as we go down the group. Reason: More is the number of electrons in the penultimate shell, more is shielding.

Carbanion contains _______ electrons in valence shell

(a) How are the following related ? (i) Number of valence electrons of the different elements present in the same group. (ii) Number of the shells of the elements in the same period. (b) How do the following change ? (i) Number of shells of the elements as we go down a group. (ii) Number of valence electrons of elements on moving from left to right in a period. (iii)Atomic radius in moving from left to right along a period. (iv) Atomic size down a group.

The number of electrons in the valence shell of a semiconductor is

The number of electrons in the valence shell of calcium is