1 Which scientist first said that "elements are made up of identical atoms
which cannot be created or destroyed"?
Bohr
Democritis
Thomson
O
Dalton
Other:

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.