(Na,P,Cl,Si,Mg )which of these has largest atoms?

1 Answer
Jun 1, 2018

Here is an important Periodic Trend that you should commit to memory....

Explanation:

Atomic size DECREASES across the Period, a row of the Periodic Table from left to right as face the Table.

Atomic size INCREASES down a Group, a column of the Periodic Table.

Why? The size of an atom is reasonably the radius of its valence electron(s). This radius is (i) a function of Zthe atomic number; and (ii), shielding by other electrons... Incomplete electronic shells shield the nuclear charge VERY INEFFECTIVELY, with the result that atomic size DECREASES markedly across the Period. And perhaps we should address some actual data now...

Wikipedia.orgWikipedia.org

Does this Table support what I have argued? Why or why not?

And so your biggest ATOM is CLEARLY sodium...you can order the sizes of the rest of the atoms...