Given below are the melting points and atomic radii of three elements X, Y and Z of the periodic table having 'r' electrons
Given below are the melting points and atomic radii of three elements X, Y and Z of the periodic table having 'r' electrons in the outermost shells of their atoms -
| X | Y | Z | |
| Melting point (oC) | 100.5 | 97.5 | 63.5 |
| Atomic radii (Ao) | 1.33 | 1.54 | 1.96 |
State four inference that can be drawn about the elements on the basis of the above data
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(i) Since each element contains the same number of valence electrons, n in the outermost shells of their atoms, therefore X, Y and Z, belong to the same group.
(ii) The atomic radii increase from X to Z so metallic character increases from X towards Z.
(iii) X, Y and Z have melting points above 25oC (room temperature). Therefore, X, Y and Z are solid at room temperature.
(iv) The ionization potential decreases from X to Z because they belong to the same group in the descending order.
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