Stion completion status:

question 1

why are electromagnets used in metal scrap yards?



they are weak permanent magnets.

they are temporary magnets, so eventually the metal just falls off.

they are very powerful permanent magnets.

they are temporary magnets, so they can be turned on and off.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.