The element with configuration 2, 8, 18, 8, 2 is Strontium (Sr), with atomic number 38.
Configuration Analysis:
- 1st shell: 2 electrons
- 2nd shell: 8 electrons
- 3rd shell: 18 electrons
- 4th shell: 8 electrons
- 5th shell: 2 electrons
- Total: 2 + 8 + 18 + 8 + 2 = 38 electrons
Element Identification:
- Name: Strontium
- Symbol: Sr
- Atomic number: 38
- Period: 5 (five shells)
- Group: 2 (alkaline earth metal)
Properties:
- Soft, silvery-white metal
- Highly reactive
- Used in fireworks (red color)
- Forms Sr²⁺ ions
Importants Points:
- Element: Strontium (Sr)
- Atomic number: 38
- Group: 2, Period 5