1st ionizaton energy has a trend from down to up and from left to right. Since Na and Al are on the same period (row), then the we look at which is the the furthest to the right and that would be Al.
D. Each element has unique energy levels.
I'm preeeety sure the answer is A, lost! Hope I helped, hon :)
Answer:
Lighter
Explanation:
In practice, the lamp is powered by an AC voltage source which is connected in series with an inductive ballast in order to supply an approximately constant current to the lamp, rather than a constant voltage. This helps to provide a stable operation. The ballast is usually inductive rather than simply being resistive to maximize resistive losses.
As this lamp current tending to zero-current point and shadow cast by the sodium flame becoming lighter.
