Answer:
6.25%
Explanation:
Given data:
Half life of lutetium-117 = 6.75 days
Percentage remaining after 27 days = ?
Solution;
Number of half lives = Time elapsed / half life
Number of half lives = 27 days / 6.75 days
Number of half lives = 4
At time zero = 100%
At first half life = 100%/2 = 50%
At second half life = 50%/2 = 25%
At 3rd half life = 25%/2 = 12.5%
At 4th half life = 12.5%/2 = 6.25%
Answer:
The answer is 1.
Explanation: Isotopes are the elements that have the same atomic number but different mass number. The atomic number is the total number of protons that each atom of that element has. This number gives identity to the element, that is, that each chemical element has its atomic number. And the periodic table is ordered in increasing order of atomic number. If in the isotopes the atomic number does not change, they have the same position in the periodic table.
Dry and desert conditions
