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Question
Define the term ‘electron affinity’.
Solution
Electron affinity is the energy released when an isolated gaseous atom acquires an electron to form an anion.
\[\ce{X (g) + e- -> \underset{(anion)}{X-(g)}+ E.A.}\]
X is any element taken in its gaseous state.
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Draw an electron dot diagram to show the formation of each of the following compounds:
Magnesium Chloride
[H = 1, C = 6, Mg = 12, Cl = 17]
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1) Write an equation to show how Y from an ion.
2) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
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In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:
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State electron affinity unit.
