Chlorine-33

Properties and data of the isotope ³³Cl.

Contents

General data

Name of the isotope:Chlorine-33; Cl-33Symbol:³³Cl or 3317ClMass number A:33 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:16Isotopic mass:32.9774520(4) u (atomic weight of Chlorine-33)Nuclide mass:32.9681263 u (calculated nuclear mass without electrons)Mass excess:-21.00333 MeVMass defect:0.2942122 u (per nucleus)Nuclear binding energy:274.05689903 MeV (per nucleus)
8.30475452 MeV (average binding energy per nucleon)Separation energy:S_N = 1.57400(7) MeV (first neutron)
S_P = 2.2768(4) MeV (first proton)Half-life:2.511(4) sDecay constant λ:0.2760442774034 s^-1Specific activity α:5.194929756571 × 10⁺²¹ Bq g^-1
140403506934.35 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = + 0.7547(3)Nuclear g-factor:g_l = 0.50313333333333Mirror nucleus:Sulfur-33Year of discovery:1940

Radioactive Decay

Half-life T_½ = 2.511(4) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	³³S	100 %	5.58259 MeV

Parent Nuclides

Direct parent isotopes are: ³³Ar, ³⁵Ca.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 16) and isobaric (same nucleon number A = 33) with Chlorine-33. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 16	Isobar A = 33
5	²¹B
6	²²C
7	²³N
8	²⁴O
9	²⁵F
10	²⁶Ne	³³Ne
11	²⁷Na	³³Na
12	²⁸Mg	³³Mg
13	²⁹Al	³³Al
14	³⁰Si	³³Si
15	³¹P	³³P
16	³²S	³³S
17	³³Cl	³³Cl
18	³⁴Ar	³³Ar
19	³⁵K	³³K
20	³⁶Ca
21	³⁷Sc
22	³⁸Ti