Read the list of elements given below. he, ne, ar, kr which of the following about the elements is true? all of them are unreactive gases. all of them are reactive metalloids. he and ne are unreactive gases and ar and kr reactive metalloids. he and ne are reactive metalloids and ar and kr unreactive gases.

1. All of them are unreactive gases.

Explanation:

1. All the elements in consideration are noble gases and one of the properties of noble gases is their u reactive nature.

Other options are false because non of the noble gases is a metalloid.

the atomic mass is the bottom number on the element.

-steel jelly

idk what the question is about