The table below lists the properties of a metallic element. where on the periodic table would this element most likely be found? shineysilver colored  forms +1 and +2 ions  compound with sulfer  is bright red  answers : group 1 , group 2, group 12 , group 13

Compound with sulfer  is bright red 

Precipitate, and gas

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.