Calcium-35

Properties and data of the isotope ³⁵Ca.

Contents

See also: List of individual Calcium isotopes (and general data sources).

General data

Name of the isotope:Calcium-35; Ca-35Symbol:³⁵Ca or 3520CaMass number A:35 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:15Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):0.75 (= neutron-proton ratio)Neutron excess (N-Z):-5Isotopic mass:35.00514(21) u (atomic weight of Calcium-35)Nuclide mass:34.9941686 u (calculated nuclear mass without electrons)Mass excess:4.78788 MeVMass defect:0.28133438 u (per nucleus)Nuclear binding energy:262.06128696 MeV (per nucleus)
7.48746534 MeV (average binding energy per nucleon)Separation energy:S_N = 17.13(36) MeV (first neutron)
S_P = 1.28(28) MeV (first proton)Half-life:25.7(2) msDecay constant λ:26.970707414784 s^-1Specific activity α:4.640611404113 × 10⁺²³ Bq g^-1
12542192984090 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Mirror nucleus:Phosphorus-35Year of discovery:1985

Radioactive Decay

Half-life T_½ = 25.7(2) ms respectively 2.57 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β⁺	³⁵K	< 0.1 %	15.770 MeV
β⁺, p	³⁴Ar	95.9(14) %	15.690 MeV
β⁺, 2p	³³Cl	4.1(6) %	11,027 MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 15) and isobaric (same nucleon number A = 35) with Calcium-35. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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