Which electron configuration represents the electrons of an atom in an excited state?

(1) 2-8-1 (3) 2-8-17-6 (2) 2-8-6 (4) 2-8-18-5

What's the reason for the location of sodium in the periodic table

In a hypothetical atom, electron Z transitions between energy levels, giving off an orange light in the transition. In the same atom, electron D gives off a violet light when it transitions between energy levels.

Is filtration is an effective method to purify water for drinking?

If you wanted to protect water from freezing, which of the compounds below would accomplish this best. NaNO3, Mg (NO3) 2, or Al (NO3) 3

If one has a solution of 0.10 m silver nitrate and it is diluted by a factor of two, what is the new concentration

What requirements must a molecule meet in order to be considered nonpolar?

Why is water (H2O) considered the "universal solvent"?

Which notations represent hydrogen isotopes?

Which of the following statements is true? Question 5 options: Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.

2 human activities that contribute to runoff into water systems