Deuterium is an isotope of hydrogen. The nucleus of a deuterium atom consists of one proton and one neutron. When two deuterium
2 answers:
Answer:
Explanation:
Remember that the atomic number of an element is the number of protons and the mass number is the number of protons plus neutrons.
1) <em>Deuterium</em> representation:
- Hydrogen: ⇒ H
- One proton: ⇒
- One neutron: ⇒ add 1 to the mass number = 1 + 1 = 2 ⇒
2) <em>Helium-3</em> representation:
- He atom with 1 neutron: ⇒ mass number = 2 + 1 ⇒
3) <em>Neutron </em>representation
- Atomic number 0 and mass number 1: ⇒
4) Nuclear equation:
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Because 25% is half of 0.5 and the half life of is given as 5,715, the time it takes to reach this amount should just be double the half life: 11430 years.
However, in other cases the problem may not have easy numbers, so below is a more mathematical approach.
The half life formula is .
Solving for t gives:
Given information:
Plug in given values and solve for t.
With correct significant figures, this would be 11000 years.