Easy
What were the limitations of Dobereiner's classification?
- AIt could not classify all known elements into triads.
- BIt was only applicable to non-metals.
- CIt failed to predict the properties of noble gases.
- DIt was based on atomic volume rather than atomic mass.
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What property do all elements in the same column of the Periodic Table as boron have in common?
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View SolutionWhich element has
$(a)$ a total of three shells,with four electrons in its valence shell?
$(b)$ a total of two shells,with three electrons in its valence shell?
$(c)$ twice as many electrons in its second shell as in its first shell?
$(a)$ a total of three shells,with four electrons in its valence shell?
$(b)$ a total of two shells,with three electrons in its valence shell?
$(c)$ twice as many electrons in its second shell as in its first shell?
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Group $16$ Group $17$ - - - $A$ - - $B$ $C$
$(a)$ Will $C$ be larger or smaller in size than $B$?
$(b)$ Which type of ion,cation or anion,will be formed by element $A$?
| Group $16$ | Group $17$ |
|---|---|
| - | - |
| - | $A$ |
| - | - |
| $B$ | $C$ |
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