For each of the following sets of atoms and ions, arrange the members in order of increasing size?

For each of the following sets of atoms and ions, arrange the members in order of increasing size:

Answer 1

your periodic table will help a lot with this question
size of atoms and ions depends upon the nuclear charge. when an ion has more electrons than protons, it is larger than its neutral atom. when an ion has more protons than electrons, it is smaller than its neutral atom
if 2 ions have the same overall charge, look at the nucleus and the one with the more protons is the one that is smallest.

Se contains 34p+ and, when 2-, contains 36e- . bigger than neutral atom
Te contains 52+ and when 2- contains 54e-, bigger than neutral atom
Se neutral = 34p+ and 34e-
Se< Te 2- < Se 2- Co 3+ 27p+ 24e- Fe 2+ 26p+, 24e- Fe 3+ 26p+, 23e- Co 3+ < Fe 3+ < Fe 2+ Ca 20p+, 20e- Ti 4+ 22p+, 18e- Sc 3+ 21p+ 18e- Ti 4+ < Sc 3+ < Ca Be 2+, 4p+, 2e- Na+, 11 p+, 10e- Ne, 10p+, 10e- Be 2+ < Na+ < Ne

Answer 2

Largest –> smallest
A) Te2-, Se2-, Se
B) Fe2+, Fe3+, Co3+
C) Ca, Sc3+, Ti4+
My last question was different but I just put it anyway:
D) Cl-, K+, Ca2+

Source(s): Mastering Chemistry

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