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According to the law of triads, when che...

According to the law of triads, when chemically similar elements are arranged in groups of three in the order of increasing atomic weights, then the________element has the atomic weight and properties roughly the average of the other two elements.

A

first

B

middle

C

third

D

every

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The correct Answer is:
A
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NCERT FINGERTIPS ENGLISH-CLASSIFICATION OF ELEMENTS AND PERIODICITY -Assertion And Reason
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  2. Assertion:According to mendeleev,the properties of elements are a peri...

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  4. Assertion:Atomic number of the element ununtrium is 113. Reason:Accor...

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  5. Assertion:In the present form of periodic table,the period number corr...

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  6. Assertion:The chemistry of the early actinoids is more comlicated than...

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  7. Assertion:The atomic size generally increases across a period and decr...

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  8. Assertion:Among isoelectronic species,the cation with the greater posi...

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  9. Assertion:On moving down the group the group,ionization enthalpy decre...

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  10. Assertion:For the elements O or F,the electron gain enthalpy is less n...

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

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  12. Assertion:Electronegativity is not a measurable quantity. Reason:The e...

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  13. Oxidation state of oxygen in OF(2) and Na(2)O is +2 and -2 respectivel...

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  14. Assertion:Boron can only form [BF(4)]^(-),whereas aluminium forms[AlF(...

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  15. Assertion:Metallic character is highest at the extremely left side of ...

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  16. Assertion:Na(2)O is basic whereas Cl(2)O(7) is acidic oxide. Reason:E...

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