Kalsiyo

Calcium, ₂₀Ca
Calcium
Appearance	dull gray, silver; with a pale yellow tint
Standard atomic weight Ar°(Ca)
	40.078±0.004; 40.078±0.004 (pinaikli);
Calcium sa talahanayang peryodiko
	potassium ← calcium → scandium
Atomikong bilang (Z)	20
Group	2
Period	4
Block	s-block
Electron configuration	[Ar] 4s2
Electrons per shell	2, 8, 8, 2
Physical properties
Phase at STP	solido
Melting point	1115 K (842 °C, 1548 °F)
Boiling point	1757 K (1484 °C, 2703 °F)
Density (at 20° C)	1.526 g/cm3
when liquid (at m.p.)	1.378 g/cm3
Heat of fusion	8.54 kJ/mol
Heat of vaporization	154.7 kJ/mol
Molar heat capacity	25.929 J/(mol·K)
Atomic properties
Oxidation states	+1, +2 (isang matapang na panimulang oksido)
Electronegativity	Pauling scale: 1.00
Ionization energies	1st: 589.8 kJ/mol ; 2nd: 1145.4 kJ/mol ; 3rd: 4912.4 kJ/mol ; (more) ;
Atomic radius	empirical: 197 pm
Covalent radius	176±10 pm
Van der Waals radius	231 pm
	Mga linyang espektral ng calcium
Other properties
Natural occurrence	primordiyal
Crystal structure	face-centered cubic (fcc) (cF4)
Lattice constant	a = 558.8 pm (at 20 °C)
Thermal expansion	22.27×10−6/K (at 20 °C)
Thermal conductivity	201 W/(m⋅K)
Electrical resistivity	33.6 nΩ⋅m (at 20 °C)
Magnetic ordering	diamagnetic
Molar magnetic susceptibility	+40.0×10−6 cm3/mol
Young's modulus	20 GPa
Shear modulus	7.4 GPa
Bulk modulus	17 GPa
Speed of sound thin rod	3810 m/s (at 20 °C)
Poisson ratio	0.31
Mohs hardness	1.75
Brinell hardness	170–416 MPa
CAS Number	7440-70-2
History
Discovery and first isolation	Humphry Davy (1808)
Isotopes of calcium t; b;
	Kategorya: Calcium; tingnan; usapan; baguhin; \| references

Ang kalsyo o kalsyum (Espanyol: calcio, Ingles: calcium, may sagisag na Ca, atomikong bilang na 20, atomikong timbang na 40.08, punto ng pagkatunaw na mula 842 hanggang 48 °C, punto ng pagkulong 1,487 °C, espesipikong grabidad na 1.55, at V na 2) ay isang elementong metalikong kahawig ng pilak at medyo may katigasan. Isa ito sa mahahalagang sangkap sa mga buto, sa mga kabibe, at sa mga dahon. Sangkap din ito sa paggawa ng plaster, apog, at semento. Natuklasan ito noong 1808 ni Humphry Davy.^[8]

Mga sanggunian

↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (ika-2nd (na) labas). Butterworth-Heinemann. p. 112. ISBN 978-0-08-037941-8.
↑ "Standard Atomic Weights: Calcium" (sa Ingles). CIAAW. 1983.
↑ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (sa Ingles). doi:10.1515/pac-2019-0603. ISSN 1365-3075.
1 2 3 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
↑ Krieck, Sven; Görls, Helmar; Westerhausen, Matthias (2010). "Mechanistic Elucidation of the Formation of the Inverse Ca(I) Sandwich Complex [(thf)3Ca(μ-C6H3-1,3,5-Ph3)Ca(thf)3] and Stability of Aryl-Substituted Phenylcalcium Complexes". Journal of the American Chemical Society (sa Ingles). 132 (35): 12492–12501. doi:10.1021/ja105534w. PMID 20718434.
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
↑ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
↑ Gaboy, Luciano L. Calcium, kalsyo, kalsyum - Gabby's Dictionary: Praktikal na Talahuluganang Ingles-Filipino ni Gabby/Gabby's Practical English-Filipino Dictionary, GabbyDictionary.com.

[1] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (ika-2nd (na) labas). Butterworth-Heinemann. p. 112. ISBN 978-0-08-037941-8.

[2] "Standard Atomic Weights: Calcium" (sa Ingles). CIAAW. 1983.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (sa Ingles). doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[Arblaster_2018-4] 1 2 3 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.

[West-5] Krieck, Sven; Görls, Helmar; Westerhausen, Matthias (2010). "Mechanistic Elucidation of the Formation of the Inverse Ca(I) Sandwich Complex [(thf)3Ca(μ-C6H3-1,3,5-Ph3)Ca(thf)3] and Stability of Aryl-Substituted Phenylcalcium Complexes". Journal of the American Chemical Society (sa Ingles). 132 (35): 12492–12501. doi:10.1021/ja105534w. PMID 20718434.

[6] Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

[NUBASE2020-7] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[Gaboy-8] Gaboy, Luciano L. Calcium, kalsyo, kalsyum - Gabby's Dictionary: Praktikal na Talahuluganang Ingles-Filipino ni Gabby/Gabby's Practical English-Filipino Dictionary, GabbyDictionary.com.

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