Kalsium

20
Ca
Kumpulan
2
Kala
4
Blok
s
Proton
Elektron
Neutron
20
20
20
Ciri-Ciri Am
Nombor atom
20
Berat atom
40.078
Nombor jisim
40
Kategori
Logam alkali bumi
Warna
Perak
Radioaktif
Tidak
From the Latin word calx, lime
Struktur hablur
Pusat Wajah Kubik
Sejarah
Calcium was known as early as the first century when the Ancient Romans prepared lime as calcium oxide.

Calcium was first isolated by Sir Humphry Davy in 1808 when he electrolyzed a mixture of lime and mercuric oxide.

Davy was trying to isolate calcium; when he heard that Jöns Jakob Berzelius and Pontin prepared calcium amalgam by electrolyzing lime in mercury, he tried it himself.
Bilangan elektron per petala
2, 8, 8, 2
Konfigurasi elektron
[Ar] 4s2
Ca
The shell of an egg is made up of primarily calcium carbonate
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
1.54 g/cm3
Takat lebur
1115.15 K | 842 °C | 1547.6 °F
Takat didih
1757.15 K | 1484 °C | 2703.2 °F
Haba pelakuran
8.54 kJ/mol
Haba pengewapan
155 kJ/mol
Muatan haba molar
0.647 J/g·K
Banyak pada kerak bumi
5%
Banyak pada alam semesta
0.007%
Pure
Kredit imej: Wikimedia Commons (Matthias Zepper)
Pure calcium in a protective argon gas atmosphere
Nombor CAS
7440-70-2
PubChem CID Number
5460341
Ciri-Ciri Atom
Jejari atom
197 pm
Jejari kovalen
176 pm
Keelektronegatifan
1.00 (Skala Pauling)
Kebolehan mengion
6.1132 eV
Isipadu atom
29.9 cm3/mol
Daya pengaliran terma
2.01 W/cm·K
Keadaan pengoksidaan
1, 2
Aplikasi
Calcium is used to remove oxygen, sulfur and carbon from alloys.

It is also used as an alloying agent used in the production of aluminum, beryllium, copper, lead, and magnesium alloys.

Calcium is used as a reducing agent in the extraction of other metals, such as uranium, zirconium, and thorium.

Calcium carbonate is used in manufacturing cement and mortar, lime and limestone.
Calcium is considered to be non-toxic
Isotop
Isotop stabil
40Ca, 42Ca, 43Ca, 44Ca, 46Ca
Isotop tidak stabil
34Ca, 35Ca, 36Ca, 37Ca, 38Ca, 39Ca, 41Ca, 45Ca, 47Ca, 48Ca, 49Ca, 50Ca, 51Ca, 52Ca, 53Ca, 54Ca, 55Ca, 56Ca, 57Ca