Elements in group via (group 16) have similar properties because they all have a. the same number of valance electrons. b. the same number of electrons needed to fill their octet. c. the same number of electrons shells. d. full octets

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Which of the following units is not an official si unit? mole liter kilogram ampere