What is the mass number of atomic number 20?
Atomic Number of Elements from 1 to 30
| Atomic Number | Element | Atomic Mass |
|---|---|---|
| 17 | Chlorine | 35.45 |
| 18 | Argon | 39.948 |
| 19 | Potassium | 39.098 |
| 20 | Calcium | 40.078 |
What is the element number 20?
Calcium
Calcium – Element information, properties and uses | Periodic Table.
What has atomic number 20 and mass number 41?
Niobium – Element information, properties and uses | Periodic Table.
Why is thorium named after Thor?
In 1815, for example, Berzelius isolated a new element from a mineral sent to him from the Swedish mining town of Falun and named it thorium after the Scandinavian god of thunder, Thor….
| Discovery date | 1829 |
|---|---|
| Origin of the name | Thorium is named after Thor, the Scandinavian god of war. |
| Allotropes |
What is the symbol of praseodymium?
PrPraseodymium / Symbol
How did dysprosium get its name?
Dysprosium was discovered in 1886 by French chemist Paul Émile Lecoq de Boisbaudran when he separated dysprosium oxide from holmium oxide. Fittingly he named the element dysprosium, from the Greek ‘dysprositos’ meaning ‘hard to obtain.
What is the atomic number of first 20 elements?
First 20 Elements
| Atomic Number | Element | Symbol |
|---|---|---|
| 17 | Chlorine | Cl |
| 18 | Argon | Ar |
| 19 | Potassium | K |
| 20 | Calcium | Ca |
What are the 20 elements and their atomic number?
What has the atomic number of 83?
Bismuth
Bismuth – Element information, properties and uses | Periodic Table.
What is meant by atomic number of calcium is 20?
The atomic number is the number of protons. The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.