Home
Class 10
CHEMISTRY
Assertion (A): According to Mendeleev, p...

Assertion (A): According to Mendeleev, periodic properties of elements is a function of their atomic number.
Reason (R): Atomic number is equal to the number of protons.

A

Both A and R are true and R is the correct explanation of A.

B

Both A and R are true but R is NOT the correct explanation of A.

C

A is true but R is false.

D

A is false and R is true.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion (A) The assertion states: "According to Mendeleev, periodic properties of elements is a function of their atomic number." - Mendeleev, the creator of the periodic table, arranged elements based on their atomic mass, not atomic number. Therefore, this assertion is **false**. ### Step 2: Understand the Reason (R) The reason states: "Atomic number is equal to the number of protons." - This statement is true. The atomic number of an element is defined as the number of protons in the nucleus of an atom of that element. ### Step 3: Conclusion Now we can conclude the relationship between the assertion and the reason: - Assertion (A) is **false**. - Reason (R) is **true**. Thus, the correct answer to the question is that the assertion is false while the reason is true. ### Final Answer - Assertion (A) is false. - Reason (R) is true. - Therefore, the correct option is that A is false but R is true. ---
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion (A) The assertion states: "According to Mendeleev, periodic properties of elements is a function of their atomic number." - Mendeleev, the creator of the periodic table, arranged elements based on their atomic mass, not atomic number. Therefore, this assertion is **false**. ### Step 2: Understand the Reason (R) ...
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAL PUBLICATION|Exercise CASE - BASED MCQs|20 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAL PUBLICATION|Exercise SELF - ASSESSMENT - 1 ( OBJECTIVE TYPE QUESTIONS) |13 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    OSWAL PUBLICATION|Exercise BOARD CORNER (Long Answer Type Questions) |7 Videos

  • OLYMPIAD 2019 - 20

    OSWAL PUBLICATION|Exercise CHEMISTRY QUESTIONS (Is Matter Around us Pure)|1 Videos

  • SAMPLE PAPER 1

    OSWAL PUBLICATION|Exercise QUESTION BANK|9 Videos

Similar Questions

Explore conceptually related problems

Assertion (A): According to Mendeleeff, periodic properties of elements is a function of their atomic masses. Assertion (R): Atomic number is equal to number of protons

According to Mendeleev's perodic law, the properties of elements are a periodic function of their

The atomic number of an element is equal to the number of

State whether the following statements are true or false: (a) Newlands divided the elements into horizontal row of eight element each. (b) According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic numbers. (c) The elements in a group have consecutive atomic numbers.

In the modern periodic table, properties of the elements are a periodic function of their atomic numbers. True/False

Assertion (A): Two atoms of different elements having same mass number but different atomic numbers are called isobars. Reason (R): Atomic number is the number of protons present and mass number is the total number of protons and neutrons present in a nucleus.

Assertion:According to mendeleev,the properties of elements are a periodic function of their atomic weights. Reason:Mendeleev left the gap under aluminium and a gap under silicon,and called these elements Eka-Aluminium and Eka-silicon.