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Assertion (A): According to Mendeleeff, ...

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

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

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Periodic Properties Of Elements - Atomic Radii

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

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.

Assertion:Atomic number is a more fundamental property of an element than its atomic mass. Reason:Atomic number is equal to number of protons in an atom.

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.

Name of Russian chemist who said that the properties of elements are a periodic function of their atomic masses.

NARAYNA-PERIODIC TABLE -All Questions
  1. The set representing the correct order of ionic radius is

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  2. The charge/size ratio of a cation determines its polarising power. Whi...

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  3. Assertion (A): According to Mendeleeff, periodic properties of element...

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  4. Assertion (A): The transition metal ions are generally paramagnetic in...

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  5. Assertion (A): Be and Al have similar properties Assertion (R): Cati...

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  6. Assertion (A): Li forms covalent compounds Assertion (R): Li^(+) ion...

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  7. Assertion (A): The nagtive ion is always larger than its atom Assert...

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  8. Assertion (A): The second ionisation energy of 'O' is greater than tha...

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  9. Assertion: Shielding effect increases as we go down the group. Reaso...

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  10. Assertion (A): Electron affinity of Flourine is less than that of chlo...

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  11. Assertion (A): The second electron affinity of oxygen is endothermic. ...

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  12. Assertion (A): The size decreases in the order O^(2-) gt Mg^(2+) gt Al...

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  13. Assertion (A): Each d-block series contains ten elements Assertion (...

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  14. Assertion (A): The first ionisation energy of B is less than that of B...

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  15. Assertion (A): The ionic size of Mg^(2+) is larger than Al^(3+) Asse...

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  16. Assertion (A): The second electron affinity of oxygen is exothermic. ...

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  17. Assertion (A): Al(2)O(3) dissolves in both NaOH and HCl Assertion (R...

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  18. Assertion (A): Cu^(+2) paramagnatic ltbr. Assertion (R): All the orbit...

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  19. Assertion (A): Zn is not a transition element. Assertion (R): Elemen...

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  20. Assertion (A): The transition metal ions are generally paramagnetic in...

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