Answer:
Atomic radii increase in size as you progress down the columns of the periodic table. This is because as you add more electrons, and fill more electron shells, the total radius across the atom increases.
The answer is Na which is sodium
Answer:
Because it is energetically favorable for atoms to be in that configuration.
Explanation:
Since not all elements have enough electrons to fill their outermost shells, atoms form chemical bonds with other atoms. Atoms react with one another to form chemical bonds because they want to ATTAIN STABILITY.
100%-64% to obtain the remaining% of the isotopes
= 36%
then,
atimic weight= (64×51) + (36×51)
=5100 amu