Calculate
Electron
Screenin
ing
constant for valance
in potassium C2 = 19)...
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List four observations that indicate that a chemical reaction may be taking place
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Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope
Answers: 1
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