Roentgenium (Rg): Bohr Model, Protons, Neutrons & Electrons
Roentgenium is element number 111, a superheavy in group 11, period 7. Its atom has 111 protons, 171 neutrons and 111 electrons arranged in 7 shells: 2, 8, 18, 32, 32, 17, 2.
- 111 protons
- 171 neutrons
- 111 electrons
Protons, neutrons and electrons in roentgenium
ال atomic number of roentgenium is 111, so every roentgenium atom has 111 protons. A neutral atom has the same number of electrons, 111. The number of neutrons depends on the isotope: neutrons = mass number − atomic number. For roentgenium-282, that is 282 − 111 = 171 neutrons. Every isotope of roentgenium is radioactive; 282 is the mass number of its most stable one.
How to draw the Bohr model of roentgenium
- Draw the nucleus and write 111 p⁺ تم تصميم [الخدمة] لمتعلمين من جميع الأعمار، بما في ذلك طلاب المدارس. 171 n⁰ inside it.
- Draw the first shell and put 2 electrons on it (the first shell holds at most 2).
- Draw the second shell and put 8 electrons on it.
- Draw the third shell and put 18 electrons on it.
- Draw the fourth shell and put 32 electrons on it.
- Draw the fifth shell and put 32 electrons on it.
- Draw the sixth shell and put 17 electrons on it.
- Draw the seventh shell and put 2 electrons on it.
- Check: 2 + 8 + 18 + 32 + 32 + 17 + 2 = 111 electrons, the same as the number of protons.
From potassium onwards the shells don’t simply fill as 2, 8, 8: the fourth shell starts before the third is full, so the real arrangement above (2, 8, 18, 32, 32, 17, 2) is the one to draw.
Electron configuration
The electron configuration of roentgenium is [Rn] 7s² 5f¹⁴ 6d⁹. As a superheavy it fills an inner d-subshell, and its common ion is variable.
Key facts about roentgenium
| Symbol | Rg |
|---|---|
| Atomic number | 111 |
| Relative atomic mass | [282] |
| Group · period · block | group 11 · period 7 · d-block |
| نوع | Superheavy |
| State at 25 °C | unknown |
| أغلفة الإلكترون | 2, 8, 18, 32, 32, 17, 2 |
| Electron configuration | [Rn] 7s² 5f¹⁴ 6d⁹ |
| Valence electrons | varies (outer shell: 2) |
| Common ion | — |
| Electronegativity (Pauling) | — |
| First ionisation energy | — |
| Atomic radius (empirical) | — |
Where roentgenium sits on the periodic table
الأسئلة الشائعة
How many protons, neutrons and electrons does roentgenium have?
Roentgenium has 111 protons and 111 electrons (atomic number 111). Its most common isotope, roentgenium-282, has 282 − 111 = 171 neutrons.
What is the electron configuration of roentgenium?
[Rn] 7s² 5f¹⁴ 6d⁹. In shells that is 2, 8, 18, 32, 32, 17, 2.
How many valence electrons does roentgenium have?
Roentgenium is a superheavy, so its valence electrons are spread over two shells; its outermost shell holds 2.
Where is roentgenium on the periodic table?
In group 11, period 7, in the d-block. It is a superheavy.
