en el simulador phet en la construcción del átomo estable de berilio, el átomo quedo de la siguiente manera: 4 protones, 4 electrones y 5 neutrones. ¿cuál será su numero de masa (a)?

What action will reduce the risk of energy on a motorcycle

Cartels control the production and pricing of goods mainly through a) the elimination of competition. b) the cooperation of their members. c) the limitation of price controls. d) the manipulation of government pressure.

Select correct answer. which factor is a component of verbal