How many iron atoms are contained in 354 g of iron?

Based on its chemical properties, identify the position of each chemical family on the periodic table.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

What energy is it when you flip on a switch on a lamp