What is the energy of a light with a wavelength of 10nm?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

What is avogadro’s number, and why is it useful

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.