WAEC - Chemistry (2017 - No. 12)
Which of the following arrangements indicates the correct decreasing order of ionization energy of period 3 elements?
Na, Al, P, Cl
Cl, P, Al, Na
Na, P, Cl, Al
Al, Na, P, Cl
ব্যাখ্যা
As you move across a period, first ionization energy increases.