The half-life of an element (A) is 20,000 years. Another element (B) has a half-life of 100,000 years. Which of the following elements will be found in a higher concentration after 200,000 years?

Element B

Explanation:

Because the half life is longer, so it will take longer for it to completely disappear.

well we can't tell you because we cant see the time give a screen shot or something.

answer; the above statement is (true);