Ionic formulas determine the chemical formula for each of the following ionic compounds:

a. strontium nitrate, an ingredient in some fireworks, signal flares, and matches
b. sodium cyanide, a compound used in electroplating and treating metals
c. chromium(iii) hydroxide, a compound used to tan and dye substances

a) Strontium nitrate - Sr(NO3)2

b) Sodium cyanide - NaCN

c) chromium(III) hydroxide - Cr(OH)3

Explanation:

strontium nitrate, an ingredient in some fireworks, signal flares, and matches

b. sodium cyanide, a compound used in electroplating and treating metals

c. chromium(III) hydroxide, a compound used to tan and dye substances

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.