5. a 25.0 gram sample of a compound contains 6.64 grams of potassium (k, at. wt. = 39.1), 8.84
grams of chromium (cr, at. wt. = 52.0), and 9.52 grams of oxygen (0, at. wt. = 16.0). find the empirical
formula of this compound.
a. k3cr03
ki cr 2 02
b. k2cro4
c. k2cr207
d. k7cr202
e. kcr04

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

Aconductor easily transfer heat