Respuesta :

Xenon has no reactivity so you know it can't be that one.  Lodine has very low reactivity so it also can't be that one.  Both Cesium and Scandine have high reactivity so it would have to be one of these two.  And since Cesium is in the alkalai group you know it has to be that one.
Lanuel

The chemical element which is very reactive and needs to lose one electron to have a full outermost shell is: B. Cesium.

Reactivity is a chemical property that determines how readily a chemical element bonds with other chemical elements, so as to form a new chemical compound (substance).

As a general rule, the ability of a chemical element to bond with other chemical elements is highly (largely) dependent on the number of valence electrons in the outermost shell of its atomic nucleus.

Hence, chemical elements with fewer number of valence electrons are the most reactive while those with more valence electrons are least reactive.

  • Alkali metals = 1 valence electrons.
  • Alkaline earth metal = 2 valence electrons.
  • Transition metal = 2 valence electrons.
  • Noble gas = 8 valence electrons.

In conclusion, Cesium is an Alkali metal with a single (one) valence electrons and as such, it is very reactive and needs to lose one electron to have a full outermost shell.

Find more information: https://brainly.com/question/18214726

Otras preguntas