Answer:
i think that the answer is B
Explanation:
I DON
<span>Technetium (TC)- Transition metal.Promethium (Pm)- Rare earth metal.<span>Polonium (Po)- Metalliod.
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Radioactivity tracers,</span>fission products,<span>controls fission reactions
</span><span>Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom.
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For example<span>, the </span>half-life<span> of a radioactive substance is the amount of time it takes for </span>half<span> of its atoms to decay, and the </span>half-life<span> of a drug is the amount of time it takes before </span>half<span> of the active elements are either eliminated or broken down by the body.</span>
First, let's remember the concepts of spontaneous and nonspontaneous reaction:
A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. This would be called an exothermic reaction, it releases energy.
A nonspontaneous reaction is a reaction that does not favor the formation of products at the given set of conditions. In order for a reaction to be nonspontaneous, it must be endothermic, accompanied by a decrease in entropy, or both.
In this case, when the reaction takes place, the temperature of the system increases which means that heat is released and heat is a form of energy. Energy is released.
The answer based on this logic would be D.
