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Choose the right properties of periodic ...

Choose the right properties of periodic table.
(a) Atomic radius increases from top to bottom along a group.
(b) Atomic radius decreases from left to right along a period.
(c) Valency remains the same in a group.
(d) lonisation energy increases on moving down a group.

A

d

B

b,c

C

a,b,c

D

a

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The minimum amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state in known as ionisation energy or ionisation enthalpy (IE_1) of the element. The energy required to remove the second electron from the monovalent cation is called second ionisation enthalpy (IE_2) . Similarly, we have third, fourth ..... inonisation enthalpies. The values of ionisation energy depends on a number of factors such as (i) size of the atom (ii) screening effect (iii) nuclear charge (iv) half filled and fully filled orbitals (v) shape of orbital. In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right. Compared to the second ionisation energy of an atom, the third ionisation

BEYOND PUBLICATION-CLASSIFICATION OF ELEMENTS THE PERIODIC TABLE-EXERCISE
  1. The outermost shell of a representative element contains x electrons a...

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  2. Which of the following statements about the modern periodic table are ...

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  3. Choose the right properties of periodic table. (a) Atomic radius incr...

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  4. Which of the following species does have electrons equal to 18 ? (a) K...

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  5. Pick out the correct statements about chlorine atom. (a) Chlroine is ...

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  6. What are the elements that belonged to 18th (or) '0' group ? (a) Heliu...

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  7. Electronic configuration from ns^2 np^1 to np^2 np^6 are called

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  8. 1 pm = …………..

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  9. block elements are called as lanthanides and actinides in modern perio...

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  10. "The law states hat the physical and chemical properties of the ...

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  11. VI A group elements are called chalcogens. This is because

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  12. The general electronic configuration of d-block elements is

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  13. The size of anion is more than neutral atom. This is due to

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  14. Which of the following is correct with respect to size ?

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  15. M^+ + IE2 =M^(+2)(g)+e^- This represents

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  16. In a period, I.E increases due to

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  17. The I.E of 'N' is more than oxygen even though the size of 'O' is less...

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  18. The formula of chloride formed by eka silicon

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  19. Which of the following atomic numbers belongs to same period ?

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  20. The size of Na^+ is less than 'Na' . This is due to

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