Question

Isotopes of chlorine different reactivates.

Answer 1

Answer on Question #49652 – Chemistry– Other

Question:

Isotopes of chlorine different reactivates.

Answer:

Chlorine (Cl) has 24 isotopes with mass numbers ranging from $^{28}\mathrm{Cl}$ to $^{51}\mathrm{Cl}$. There are two principal stable isotopes, $^{35}\mathrm{Cl}$ (75.78%) and $^{37}\mathrm{Cl}$ (24.22%), found in the relative proportions of 37.89:12.11, respectively, giving chlorine a standard atomic mass of 35.453. The longest-lived radioactive isotope is $^{36}\mathrm{Cl}$ which has a half-life of 301,000 years. All other isotopes have half-lives under 1 hour, many less than one second. The shortest-lived are $^{29}\mathrm{Cl}$ and $^{30}\mathrm{Cl}$, with half-lives less than 20 and 30 nanoseconds.

$^{36}\mathrm{Cl}$ is a hydrophilic nonreactive isotope, but it half-life makes it suitable for geologic dating in the range of 60,000 to 1 million years.

$^{35}\mathrm{Cl}$ has the highest electron affinity and the third highest electronegativity of all the reactive elements. That's why chlorine is so reactive substance and for this reason, chlorine is a strong oxidizing agent. Free chlorine is rare on Earth, and is usually a result of direct or indirect oxidation by oxygen.

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