Answer: 5
Explanation: add up all the electrons and it will amount to 23. Arranging by the old model for electronic configuration, we have : 2, 8, 8, 5
The last number being 5 represent its valence electron
Answer: Evaporation Condensation is used to seperate the parts of a mixture
Explanation: This is because it is the first order of the distilation process
It required a fixed finite amount these zones are known as energy levels
The answer is C because there are 22 oxygen atoms on the product side so to balance the equation the coefficient needed is 11
