Answer: A
Explanation: the only way to turn it from blue to yellow is to mix it with an acidic solution.
The correct answer is C : energy level.
As you can see in the image of the periodic table presented below, periods are the horizontal columns of the periodic table.
Elements belonging to the same period have the same electron shell, the same number of orbits filled with electrons.
Elements of the same period have similar chemical and physical characteristics
Answer:
There are way in separating mixtures of chloride salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration, and sublimation. The easiest method among the three is separation by sublimation.
Gamma rays and x- rays have the highest penetrating power
I believe your answer is 23.
Credit: answers.yahoo.com
Hope this helps!