Question

why t atomic size of Al3+ <Li+<Mg2+<K+m
can anyone tell with the reason?​

Answer 1

First of all, in this question the examiner is asking you about the size of different atoms or elements or the atomicity of elements.

Atomic size is the size of an atom. An atom will have higher atomic size if it has a greater atomic number.

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Answer 2

Answer:

well Al3+ is smallest amoung the group

Explanation:

Al3+ and Mg2+ are isoelectronic species i.e have same no of electrons. Their nuclear charges differ Al has a +13 charge in nucleus and Mg has a +12 charge. therefore Al3+<Mg2+.

Li+ has charge of 3+ and K+ has charge of 19+ but here K+ is greater as it has more no.of shells compared to Li+.

You need to follow the trend of atomic radii of periodic table.