Kalsiyum

Kalsium,₂₀Ca

General properties
Wujud	putih asemu pérak
Bobot atom standar(Ar, standard)	7001400780000000000♠40.078(4)
Kalsium in theperiodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mg ↑ Ca ↓ Sr kalium←kalsium→skandium
Atomic number(Z)	20
Group	group 2 (alkaline earth metals)
Period	period 4
Blok	s-block
Konfigurasi èlèktron	[Ar] 4s2
Electrons per shell	2, 8, 8, 2
Sipat angga
PhaseatSTP	solid
Melting point	1115K​(842 °C, ​1548 °F)
Boiling point	1757 K ​(1484 °C, ​2703 °F)
Density(nearr.t.)	1,55 g/cm3
when liquid (atm.p.)	1,378 g/cm3
Heat of fusion	8,54kJ/mol
Heat of vaporization	154,7 kJ/mol
Molar heat capacity	25,929 J/(mol·K)
Vapor pressure P(Pa) 1 10 100 1 k 10 k 100 k atT(K) 864 956 1071 1227 1443 1755
Atomic properties
Oxidation states	2​oksidabasakuwat
Electronegativity	Pauling scale: 1,00
Ionization energies	(more)
Atomic radius	empirical:180pm calculated:194pm
Covalent radius	174pm
Spectral lines
Miscellanea
Crystal structure	​kubik mawa punjer muka Kubik mawa punjer muka crystal structure for kalsium
Speed of soundthin rod	3810 m/s (at 20 °C)
Thermal expansion	22,3 µm/(m·K) (at 25 °C)
Thermal conductivity	201 W/(m·K)
Electrical resistivity	33,6 n Ω·m (at 20 °C)
Magnetic ordering	paramagnetik
Young's modulus	20 GPa
Shear modulus	7,4 GPa
Bulk modulus	17 GPa
Poisson ratio	0,31
Mohs hardness	1,75
Brinell hardness	167 MPa
CAS Number	7440-70-2
Mainisotopes of kalsium
Iso­tope Abun­dance Half-life(t1/2) Decay mode Pro­duct 40Ca 96,941% Castabilkanthi 20neutron 41Ca syn 1,03×105taun ε - 41K 42Ca 0,647% Castabilkanthi 22neutron 43Ca 0,135% Castabilkanthi 23neutron 44Ca 2,086% Castabilkanthi 24neutron 45Ca syn 162,7 hari β- 0,258 45Sc 46Ca 0,004% >2,8×1015taun β-β- ? 46Ti 47Ca syn 4,536 hari β- 0,694, 1,99 47Sc γ 1.297 - 48Ca 0,187% >4×1019taun β-β- ? 48Ti

Kalsium(calcium(Ca)), iku unsur élemènkimia,salah sawijinélogamalkalinbumisaka golongan 2 (IIa) ing tabel periodik.Kalsium iku unsur logam kang akèh dhéwé sajeroningawakmanungsalan élemèn kalima kang akèh dhéwé ing kerakBumi.

Kalsium lan manungsa

Kalsium yaiku nutrisi kanggobalung.Kira-kira 99% kalsium ana ing njero jaringan keras yaikubalunglanuntu.1% kalsium ana inggetih,lan jaringan lunak.tanpa kalsium kang 1% iki,ototngalami gangguan kontraksi, getih angèl mbeku, tranmisisarafana masalah, lan sapituruté.kanggé njangkepi 1% kabetahan iki, awak njupuk panganan kang dipangan saka balung.Upama panganan kang dipangan ora cukup, mangka dijupuk saka balung.saé ngga balung bisa diarani cadangan kalsium.Upama kadadéan iki selang wektuné suwé, mangka balung bakal ngalami keropos balung.Kalsium zat kang dibutuhaké saka bayi nganti tuwa.Cacahé kabutuhan kalsium dibedakaké miturut jinis kelamin lan umur.Miturutdhoktergizi,kabutuhan wong-wongIndonésiaiku antarané500-800mg/dina.Wektu wong kang wis tuwa lanwadonménopause disaranke ngombé asupan kalsium1000mg/dina.