We know that a neutral atom of bromine is larger than a neutral atom of magnesium because: a. group number tells us how many electron orbitals surround a nucleus; bromine is in group 7a while magnesium is in group 2a. b. period number tells us how many electron orbitals surround a nucleus; bromine is in period 4 while magnesium is in period 3. c. bromine and magnesium have very different physical and chemical properties.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative