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Question:Ions are atoms with either extra electrons or missing electrons. Thus, ions have a negative or positive charge. Examples, The potassium atom, K, has 19 protons and 19 electrons. The potassium ion has 19 protons and 18 electrons, written K1+ (1 more proton than electron). The nitrogen atom, N, has 7 protons and 7 electrons. One nitrogen ion has 7 protons and 10 electrons, written N3- (3 more electrons than protons). I think the answer is Ca2+ i just want to be 100% sure

Answers:Ca2+ has 18 electrons

From Youtube

Calcium Chloride Flame Test :This is the '08-'09 school year's flame test demonstration. It went better than last year's demonstration (I have 3 videos of those on YouTube), but not as good as my first year's still (I have 7 of those videos [eg www.youtube.com The flame test is preformed by burning a metal salt using a flammable liquid. Each chemical (in this case metal ion) gives off a characteristic color (seen here as changes in colors of the flames) when the electrons fall back down from their excited state and emit light at certain wavelengths (colors). This year I decided to do something different and filmed each salt individually. An alcohol is used to burn all of these salts, this one is calcium chloride (CaCl2) which has an orange flame.