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Question
Element A has 2 electrons in its M shell. Element B has atomic number 7.
Write equations to show how A and B form ions.
Solution
\[\ce{A - 2e- -> A^2+}\] (cation)
\[\ce{B + 3e- -> B^3-}\] (anion)
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| \[\begin{array}{cc} \phantom{..}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\ \phantom{..}|\phantom{....}|\phantom{....}|\\ \ce{H - C - C- C- H}\\ \phantom{.}|\phantom{....}|\phantom{....}|\\ \ce{H - C - H}\\ |\\\ce{H}\end{array}\] |
