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Grade: 11

                        

Arrange the following in order of there increasing size: Cl -- ,S 2- ,ca 2+ ,At.

2 years ago

Answers : (1)

Arun
24742 Points
							
the size increases as you go down the periods and towards the left of the periodic table. 

less electrons means smaller atoms. 

from smallest to largest: 
Ga3+, Ca2+, K+, Cl-, S2-. 

Electrons in the electron cloud are constantly repelling each other and the more electrons the larger the shell. Since all of these atoms have the same number of electrons, the only thing that changes are the number of protons. The more protons the stronger the pull of the nucleus is on the electrons, so the electrons get closer. Ga has many more protons than any of the other ions so its pull on the electrons is much stronger. On the other side of the spectrum, S has the least number of protons meaning the weakest pull on the electrons.
2 years ago
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