Question

Why is there a gap in the modern periodic table?FOR EXAMPLE :The space between magnesium and aluminium

Answer 1

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There are no gaps in the periodic table. Atomic numbers of known elements go from 1 to something over 115 with no missing numbers. The atomic number tells you the number of protons in the nucleus and by extension electrons in the shell, they can only be integers.

The periodic table is arranged in the way it is because it doesn’t describe just the existence of elements but their chemical properties. Chemistry is the physics of the valence (outermost) electron and the periodic table of elements doesn’t describe atomic nuclei, it describes the valence electrons. Apparent gaps in the periodic table of elements are gaps between energy levels of valence electrons orbitals.

The gap between hydrogen and helium is there because they have electons only in the s orbital and none in p, d or f orbitals.

Same case is for magnesium and aluminium.
By definition of element no, the gaps could not be filled with anything, because there isn’t anything there to fill it.


HOPE THIS HELPS YOU.

@UJJWAL KHARKWAL@
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Answer 2

Explanation:

There are no gaps in the periodic table. ... Apparent gaps in the periodic table of elements are gaps between energy levels of valence electrons orbitals. The gap between hydrogen and helium is there because they have electons only in the s orbital and none in p, d or f orbitals. Same case is for magnesium and aluminium.

Hope this will help you