Consider this row in the periodic table of elements. As we move from left to right, across the row, the elements

A) change from nonmetals to metals.
B) change from metals to nonmetals.
C) start as gases but end as solids.
D) show a decrease in atomic mass number.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=