Explain why you would expect to find the element Krypton in its uncombined form, while Lithium and Chlorine are found combined together. a. Identify the valence electrons for each element.

b. Describe the group reactivity for each element.

Iwould google this

Ametal with a large number of free flowing electrons most likely has good conductivity

2licl + 3o2 i yook the test and it was correct.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.