I need help with these questions on my chemistry homework! 1) Arrange the follow
ID: 853842 • Letter: I
Question
I need help with these questions on my chemistry homework!1) Arrange the following ions in order of increasing ionic radius? (begin with the smallest) Br-, S2-, K+, Ca2+. Explain the reasons for choosing your preferred order.
2) calculate the number of miles of Cr2O3 in 0.473 g of Cr2O3-. I need help with these questions on my chemistry homework!
1) Arrange the following ions in order of increasing ionic radius? (begin with the smallest) Br-, S2-, K+, Ca2+. Explain the reasons for choosing your preferred order.
2) calculate the number of miles of Cr2O3 in 0.473 g of Cr2O3-.
1) Arrange the following ions in order of increasing ionic radius? (begin with the smallest) Br-, S2-, K+, Ca2+. Explain the reasons for choosing your preferred order.
2) calculate the number of miles of Cr2O3 in 0.473 g of Cr2O3-.
Explanation / Answer
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)
Molar mass of Cr2O3 = 151.9904 g/mol
no. of moles are 0.003