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why the ionic radii for S2- is larger than O2-
Determine the ppm of K+ ions in an aqueous solution, given that there are 0.300 g of KCl in 1.50 L of water. Assume the density of water is 1.00 g mL-1 .
Determine all possible ratios for the following balanced chemical equations.
a) 4Al(s) + 3O2(g)→2Al2O3(s)
b) 3Fe(s) + 4H2O(l) → Fe3O4(s) + 4H2(g)
It is appropriate to return any excess solvent or solution back into the reagent bottle
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The four successive ionization energies for an unknown element are;
I1=896kJ/mol
I2=1752kJ/mol
I3=14807kJ/mol
I4=17948kJ/mol
To which family in the periodic table does the unknown element most likely belong?
A real gas behaves most like an ideal gas under the following conditions:
20cm^3 of carbon dioxide has sparked with 20cm^3 of oxygen. If all the volume of gases are measured at stp calculate the volume of residual gas after sparking
Calculte the number of moles in200g of O gas
I am trying to understand electron configuration backfilling because I see that there is 2,8,16,2 for NI then it skips to 2,8,18,1 for CU
some say CU is 2, 8, 18, 1 and others say CU is 2, 8, 17, 2
Then I heard the atoms holds 8 electrons and fills 17 (What is the difference between hold and fill)
also don't see how the 3rd row when move it up to the 3rd row, how the numbers fit in sequence?
- From 1 part of the question, which is the hold and fill. I think it means that to fill would be referring to bonding with other atoms
- but then again according to this definition I still don't understand: A stable arrangement is attended when the atom is surrounded by eight electrons. This octet can be made up by own electrons and some electrons which are shared. Thus, an atom continues to form bonds until an octet of electrons is made. This is known as octet rule by Lewis.
