Kalsium

20
Ca
Golongan
2
Periode
4
Blok
s
Proton
Elektron
Neutron
20
20
20
Sifat Umum
Nomor atom
20
Massa atom
40,078
Nomor massa
40
Kategori
Logam alkali tanah
Warna
Perak
Radioaktif
Tidak
From the Latin word calx, lime
Struktur kristal
Kubik Berpusat-muka
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.
Elektron per kulit
2, 8, 8, 2
Konfigurasi elektron
[Ar] 4s2
Ca
The shell of an egg is made up of primarily calcium carbonate
Sifat Fisika
Fase
Solid
Kepadatan
1,54 g/cm3
Titik lebur
1115,15 K | 842 °C | 1547,6 °F
Titik didih
1757,15 K | 1484 °C | 2703,2 °F
Kalor peleburan
8,54 kJ/mol
Kalor penguapan
155 kJ/mol
Kapasitas kalor molar
0,647 J/g·K
Kelimpahan di kerak bumi
5%
Kelimpahan di alam semesta
0,007%
Pure
Kredit Gambar: Wikimedia Commons (Matthias Zepper)
Pure calcium in a protective argon gas atmosphere
Nomor CAS
7440-70-2
PubChem CID Number
5460341
Sifat Atom
Jari-jari atom
197 pm
Jari-jari kovalen
176 pm
Elektronegativitas
1,00 (Skala Pauling)
Potensi Ionisasi
6,1132 eV
Volume atom
29,9 cm3/mol
Kondusivitas termal
2,01 W/cm·K
Bilangan oksidasi
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