Question
Download Solution PDFWhich of the following element does not contain 'one' electron in its valance shell?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Ca.
- The electrons configuration of Ca is 2, 8, 8, 2.
- So it has 2 electrons in the valance shell.
Important Points
| Element | Electrons Configuration |
| Na | 2, 8, 1 |
| Li | 2, 1 |
| H | 1 |
Additional Information
- Inner-shell electrons: Those electrons that are not in the outer shell and are not involved in the reactivity of the element.
- Valence electrons: The electrons in the highest occupied principal energy level of an atom.
- Phosphorus (P) has the maximum number of valence electrons, equal to 5.
- Electronic configaration of P is 2, 8, 5.
- In the periodic table, valance electrons are indicated by Group number.
- Argon (Ag) has 8 valance electrons in the third shell.
- The Fixed position of valance electrons makes material insulators.
- The unreactive inert gas has a full shell of valance electrons.
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