2 Points
Which of the following represents beta decay?
O A. 991c- TC+y
O B. 199 Eu+ e - 1995
O c. 1996. – 1997b+_e
O D. "Gd– 145m + He
SUBM

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

For a collision to be successful you need 2 different objects 

Catalysts and intermediateshope i

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.