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We know that atomic radius decreases along a period and increases along a group. (Same goes for metallic character)

But if we take 2 elements A & B(A is at somewhere in the top and left in periodic table and B is somewhere is below and right of B) then which among A and B will have greater atomic radius and more metallic character?

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    $\begingroup$ If you increase both (positive) A and B, will A/B increase or decrease? If you get answer for this, you will have answer for your question. $\endgroup$
    – Poutnik
    Commented Mar 4, 2022 at 6:46
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    $\begingroup$ The question is looking very vague, to me at least. $\endgroup$
    – Nilay Ghosh
    Commented Mar 4, 2022 at 7:19
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    $\begingroup$ Title is not matching the question (if I understand the question). $\endgroup$
    – Greg
    Commented Mar 4, 2022 at 10:31
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    $\begingroup$ Such generalisations are hardly useful. Despite having a somewhat similar atomic diameter and "metallicity", A and B will have very different chemical properties. $\endgroup$
    – Karl
    Commented Mar 4, 2022 at 17:39

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If the period effect for B overrules the group effect, B will have the greater atomic radius than A.

If the group effect for B overrules the period effect, B will have the smaller atomic radius than A.

The same for the element metallic character.

For the p elements, you can see the metalicity boundary goes somewhat diagonally.

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