Draw the bohr model for two different isotopes of calcium; Ca-42 and Ca-44

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two