Calculate the wavelength (nm) of light emitted when an electron relaxed form n = 4 to n=1.
(planck's constant, h = 6.63 x 10-34 js, speed of light, c = 3.00 x 108 ms, rydberg constant, rh = 2.18
* 10-18 j).

What does an electron configuration for an atom relate to the atoms placement on the periodic table

What is the reaction between an acid and a base

In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.