11) Identify the number of elements and the number of atoms present in the chemical formula. NaHCO ² 4; 6
5; 6
4,5
3; 5

Elements that do not have full outer electron shells will donate, share, or take electrons from other atoms. choose the items that have the correct binary ionic formula.

Compare and contrast physical changes with chemical changes.

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.