Ca
Calcium is the most abundant metal in the human body, essential for bones, teeth, and cellular signaling.
Physical Properties
| পদাৰ্থ | 40.078 u |
| ঘনত্ব | 1.55 g/cm³ |
| Melting Point | 1115.0 K |
| উত্তাপৰ বিন্দু | 1757.0 K |
| আকৃতি | Dull gray, silver metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 1.0 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 589.8 kJ/mol |
| ইলেকট্ৰন | 2.37 kJ/mol |
| Oxidation States | +1, +2 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Ar] 4s2 |
| পৰমাণু | 197.0 pm |
| কোভালেন্ট বেৰিয়াড | 176.0 pm |
| Van der Waals Radius | 231.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Humphry Davy |
| আবিষ্কাৰৰ বছৰ | 1808 |
| অৱস্থান | London, England |
| Named After | Latin 'calx' meaning lime |
বিষয়ে Calcium
Calcium is a soft, silvery-white alkaline earth metal and the fifth most abundant element in Earth's crust. It is essential for bones, teeth, and shells. Calcium ions serve as key signaling molecules in cellular processes.
Uses & Applications
Cement and concrete, plaster of Paris, steel refining, antacids, dietary supplements, and water treatment.
মজা কথা
The human body contains about 1 kg of calcium, 99% in bones and teeth. Your skeleton is replaced about every 10 years.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 40 | 0.96941% | - | Yes |
| 42 | 0.00647% | - | Yes |
| 44 | 0.02086% | - | Yes |
ইলেকট্ৰন
[Ar] 4s2