Chemistry Help: Which of the following species has the greatest number of electrons?

Question

Which of the following species has the greatestnumber of electrons?1. Al+2. Si2+3. Na+4. Mg−5. Mg6. Al2+7. Na−8. P3+Can you please explain how you got the answer? I never really understood this in class.Thank you!

Johathan Wehner · Accepted Answer

The general formula for this problem isAtomic number – the charge = the number of electrons.Al Atomic number = 13Al – 1 = the number of electrons.13 – 1 = 12 So this species has 12 electrons left.Si = 14Si – 2 = number of electrons.14 – 2 = 12Magnesium = 1212 – (-1) = 13 Note: Mg would be hard pressed to take on an electron. Also note how the extra electron contributes a second minus sign. That’s because an electron is minus and the formula asks us to use a minus.Mg [no charge]Mg – 0 = number of electrons.12 – 0 = 12 I’ll let you do the rest of them. Just use the formula.

Johathan Wehner · Answer

The element’s periodic table number represents the number of Electrons the atom has originally. If it is positively charged then it has that many less electrons and if its negatively charged it has that many more electrons soAl normally has 13Al+ has 12Si normally has 14Si2+ has 12Na normally has 11Na+ has 10Mg has 12Mg- has 13Al2+ has 11Na- has 12P normally has 15P3+ has 12So Mg- has the greatest number of electrons

Johathan Wehner

Chemistry Help: Which of the following species has the greatest number of electrons?

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