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puppycity78
11.12.2019 •
Chemistry
Which of the elements has the highest first ionization energy
c
si
ge
sn
pb
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Ответ:
Ответ:
Explanation:
I believe the answer would be:
Te2- > I- > Cs+ > Ba2+ > La3+ (from biggest to smallest)
This is what you wrote above. This makes sense because all 5 ions are isoelectronic with xenon (i.e. they all have 54 electrons) but the number of protons (positively charged particles in the nucleus of the atom) of each is different:
La3+ has 54 electrons and 57 protons, meaning that there are 3 additional positive charges to attract the negatively-charged electrons, bringing them closer in towards the nucleus (a "stronger" grip, and therefore, smaller-sized ion if you can imagine).
Ba2+ has 54 electrons but 56 electrons (only 2 additional positive charges).
Cs+ has 54 electrons and only 55 protons (only 1 additional positive charge).
I- has 54 electrons and only 53 protons (1 fewer positive charge).
Te2- has 54 electrons and only 52 protons (2 fewer positive charges).
Anions (negatively charged ions) that are isoelectronic with a particular noble gas (in this case, xenon) are generally larger in size than cations (positively charged ions) that are also isoelectronic with the same noble gas.