The chemical properties of the element having which of the following atomic numbers are similar to magnesium?
4
Elements in the same group of the periodic table have similar chemical properties because their valence-shell electronic configurations are alike.
Magnesium has atomic number 12 and its configuration is \(2,\,8,\,2\), so it belongs to group 2 with two valence electrons.
The element with atomic number 4 is beryllium, whose configuration is \(2,\,2\), also with two valence electrons; it therefore lies in the same group as magnesium.
Atomic numbers 11, 13 and 19 correspond to sodium, aluminium and potassium, which belong to different groups.
Hence, 4.
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