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Which one among the following is correct regarding 20Ne, 23Na+, 19F– and 24Mg2+?

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Which one among the following is correct regarding <sup>20</sup>Ne, <sup>23</sup>Na<sup>+</sup>, <sup>19</sup>F<sup>– </sup>and <sup>24</sup>Mg<sub>2</sub><sup>+</sup>?






 
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