Which isoelectronic ion is the biggest?

Which isoelectronic ion is the smallest in size?

  • Answer:

    Since isoelectronic means "same number of electrons," then these ions differ in the number of protons in the nucleus (which pull the oppositely-charged electrons inward). Therefore, the more protons there are, the harder they pull on the electrons, making a smaller atom. A) The smallest in size is Al3+ since Al has the largest number of protons (13). B) Same answer as (a).

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Since isoelectronic means "same number of electrons," then these ions differ in the number of protons in the nucleus (which pull the oppositely-charged electrons inward). Therefore, the more protons there are, the harder they pull on the electrons, making a smaller atom. A) The smallest in size is Al3+ since Al has the largest number of protons (13). B) Same answer as (a).

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