Question

if relative atomic mass of cl is 35.45. what is the ratio of 35cl :37cl present in a sample of cl atoms containing naturally occurring cl​

Answer 1

Chlorine (17Cl) has 25 isotopes with mass numbers ranging from 28Cl to 52Cl and 2 isomers (34mCl and 38mCl). There are two stable isotopes, 35Cl (75.77%) and 37Cl (24.23%), giving chlorine a standard atomic weight of 35.45. The longest-lived radioactive isotope is 36Cl, 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 29Cl and 30Cl, with half-lives less than 10 picoseconds and 30 nanoseconds, respectively—the half-life of 28Cl is unknown.

Main isotopes of chlorine

(17Cl)

Iso­tope Decay

abun­dance half-life (t1/2) mode pro­duct

35Cl 76% stable

36Cl trace 3.01×105 y β− 36Ar

ε 36S

37Cl 24% stable

Standard atomic weight Ar, standard(Cl)

[35.446, 35.457][1]

Conventional: 35.45

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