A photon was absorbed by a hydrogen atom in its ground state, and the electron was promoted to the forth orbit. When the excited atom returned to its ground state, visible light
was emitted. In this process, radiation of what wavelength must. have been emitted (R=
1.097 x10' m )? Explain.

The ph of carrots are 5.0 how it is classified a.acidic b.basic c.indicator d.neutral

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

What’s the scientific notation for the number 6,840,000,000