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What is Atomic Mass? - List of Elements Sorted by Atomic Mass of Iron, Sulphur, Potassium, Chlorine Etc
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Valence Electrons & Energy Levels of Elements | How Many Electrons Does Each Element Have? - Video & Lesson Transcript | Study.com
the atomic mass of an element is 19.the second shell of its atom contains 7 electrons.the number of protons in its nucleus is
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