Answer:
The best and most correct answer among the choices provided by your question is the fourth choice.
The data explains that sodium atoms hardly ever form 2+ ions.
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Explanation:
Answer:
The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.
Explanation:
The energy of nth energy levels of the H atom is given as:

Energy of the seventh energy level = 


Energy of the seventh energy level = 


Energy of the light emitted will be equal to the energy difference of the both levels.


Wavelength corresponding to energy E can be calculated by using Planck's equation:


The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.
Answer:
Acids are compounds that dissociate (break) into hydrogen (H+) ions and another compound when placed in an aqueous solution.
Explanation:
The one with the largest atomic radius is barium
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Answer:
Zinc, copper sulfate
Explanation:
The reactants are the ones on the left side