The half-life of a radioactive nucleus is the time it takes for of the nuclei in a sample to decay. A)

one-fourth

B)

half

C)

50 disintegrations

D)

100 units

a

Explanation:

porque os lfliosof osalo descidieroinyo  ntest e enantill san acas iymedeoj cro eto

c o

B.)  The half-life of a radioactive nucleus is the time it takes for HALF of the nuclei in a sample to decay.

I hope this helps!

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.