if we double only the spring constant of a vibrating ideal mass-and-spring system, the mechanical energy of the system

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic 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=