Celery stalks that are immersed in fresh water for several hours become stiff and hard. similar stalks left in asalt solution become limp and soft. from this we can deduce that the cells of the celery stalks are

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Why does his teacher ask him to balance the equation by including the correct coefficient