how many electrons are in an atom with an atomic number of 20, an atomic mass of 45 and a charge + 2
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Step-by-step explanation:
इलेक्ट्रॉन =प्रोटोन की संख्या =इलेक्ट्रॉन की संख्या =परमाणु संख्या
अतः इलेक्ट्रॉन 20है
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