Question

Which atom is larger?
B, Mg, Be, or Si?

Answer 1

Answer:

Na is the large

hope it will help you

Answer 2

Answer:

$\sf{Mg}$

Explanation:

$\sf{As\;we\;move\;down\;the\;group,}$ $\sf{then\;the\;size\;increases\;whereas}$ $\sf{across\;the\;period\;size\; decreases}$

Look at the periodic table above and apply the explanation which I gave for better understanding

Still let me explain,

Mg is down the group and Si is also down the group

So here comes the second point which is across the period size decreases hence Mg is larger