Two of the three electrons in a lithium atom have quantum numbers of n=1, l=0, ml=0, ms = +1/2, and n=1, l=0, ml=0, ms =-1/2. What quantum numbers can the third electron have if theatom is in: a) its ground state
b) its first excited state?

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

How do you know how many valence electrons an atom has?