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tigry1 [53]
3 years ago
7

Which of the following ions would represent the ion of an element from Group 2A?

Chemistry
2 answers:
Margaret [11]3 years ago
8 0
The best and most correct answer among the choices provided by the question is the fourth choice or letter D.
 <span>A2+ would represent the ion of an element from Group 2A</span>

I hope my answers has come to your help. God bless and have a nice day ahead!
Lina20 [59]3 years ago
3 0

An element belongs to particular group is related to the number of electrons present in the outer shell of the atoms. In given case, group is 2, therefore, number of valence electrons is 2 implies it has ability to lose two electrons to get +2 charge.

A\rightarrow A^{+2}+2e^{-}

Therefore, ion formed after removal of two electrons is A^{2+}.

Hence, option (D) is the correct answer.






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To obtain the enthalpy change for a reaction from bond energies what we do is to make an inventory of the bonds broken and formed for the balanced chemical reaction:

C₂H₂ + 5/2O₂   ⇒   2CO₂ + H₂O

Bond Broken                                    Bonds Formed

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Enthalpy bond formed:

4 mol (802 kJ/mol) + 2 mol (462 kJ/mol) = 4132.0 kJ

ΔH rxn = H broken - H formed =  3121.5 kJ - 4132.0 kJ = - 1010  kJ (per mol C₂H₂ )

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Read 2 more answers
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