Why do elements in the same group have similar physical and chemical properties

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

Drive down any three characteristic of modern periodic table

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg