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Which of the following set of elements c...

Which of the following set of elements can not be a triad ?

A

Li, Na, K

B

B, Al, Ga

C

Ca, Sr, Ba

D

CI, Br, I

Text Solution

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The correct Answer is:
B
B, Al & Ga is not a triad because the atomic weight of Al is not equal to average atomic weight of .B. and .Ga..
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NTA MOCK TESTS-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES TEST -SINGLE CHOICE
  1. The correct order of increasing oxidising power is

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  2. Which of the following is a typical element?

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  3. Calculate the electronegativity of fluorine using the following data. ...

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  4. Which of the following set of elements can not be a triad ?

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  5. Which among the following is the incorrect order of size?

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  6. The first ionisation energies in eV/atom of magnesium and aluminium ar...

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  7. Which one of the following is not a representative element?

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  8. The 15 elements have been placed in VI period and third group of the p...

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  9. The atomic masses of Li and K are 7 and 39, respectively. According to...

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  10. A trend which is common to elements of both the group 1st and group 17...

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  11. Which among the following statements is correct?

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  12. Which of the following is incorrect ?

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  13. The ionic radii (in Å) of N^(3-),O^(2-) and F^- are respectively:

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  14. The attractive force exerted by an atom on an electron pair shared wit...

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  15. The correct order of covalent, van der Waals and crystal radii is

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  16. The effective nuclear charge for an electron in ""7N^14 will be (usin...

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  17. What is the atomic number of the element with symbol Uus?

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  18. The atomic number of an element is 35. What is the total number of ele...

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  19. Which of the elements, whose atomic number are given below, cannot be ...

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  20. The atomic number of element Unq is

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