Which identifies as an oxidation-reduction reaction? a. a double replacement reaction b. a neutralization reaction c. a reaction in which oxidation numbers change d. a reaction in which no electrons are transferred

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

What substance has a mass of 9.5g and volume of 2.1cm^3

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.