March 1, 2017

Homework Help: Physics

Posted by jenish on Thursday, February 7, 2008 at 8:44pm.

Lithium is the atom which has three protons in its nucleus and three electrons circling the nucleus.(it usuallly has 3 nuetrons as well,but they r not important in this problem.)Two of the electrons circle the nucleus at a distance 1.8* 10^-11 m (app.)The third electron is farther away at about 1.4 * 10^-10 m from the nucleus and is called the valence electron.
a)Treating the nucleus as a point of charge of value +3e find the force on the valence electron.
b)The electrical force is what supplies the centripetal acceleration (v^2/r) necessary for the electrons circular motion.With what speed does the valence electron circle the nucleus?
c)Find the ionisation energy i.e the energy needed by an electron to completely escape its nuclues, for the lithium atom's valence electron.The ionisation energy is the negative of the electrons total energy E=1/2mv^2 + PE. the PE is that of an electron starting from infinity and being brought to the distance given above from the point charge nucleus.

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