The scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is:

  • A
    John Newlands
  • B
    Johann Wolfgang Dobereiner
  • C
    Henry Moseley
  • D
    Dmitri Ivanovich Mendeleev

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Similar Questions

Arrange the following elements in the order of their decreasing metallic character:
$Na, Si, Cl, Mg, Al$

The order of decreasing atomic size is:

Arrange the following elements in increasing order of their atomic radii.
$(a)$ $Li, Be, F, N$
$(b)$ $Cl, At, Br, I$

Which among the following elements has the largest atomic radii?

$Na, Mg, Al, Si, P, S, Cl$ and $Ar$ are the elements of the third period.
$(a)$ Which one of them is an inert gas? Why?
$(b)$ Which one of them has a valency of $4$? What kind of bond does it form: ionic or covalent?
$(c)$ Which of them are electropositive? Pick any two.

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