IC
L'énergie a la capacité de provoquer deux phénomènes.
ma
Quelle unité de mesure permet
d'óunluor uno quantité d'énergie ?

The answer is yes b ffgnbsfgnbnfgbnfgsnb

A.(nh4)(2co3)is the correct answer 

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

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts