Elements with valency 1 are

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Always metals

Either metal or non-metal

Always non-metals

Always metalloids

answer is C.

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Detailed Solution

Elements with valency 1 are either metals or non-metals (H is non-metal with valency 1)

Metals with Valency 1:

These are alkali metals (Group 1) that have one electron in their outermost shell. They tend to lose this electron to achieve a stable electronic configuration (forming +1 cations).

Examples:
- Hydrogen (H) (acts as a non-metal in most cases but can exhibit metallic behavior under certain conditions)
- Lithium (Li)
- Sodium (Na)
- Potassium (K)
- Rubidium (Rb)
- Cesium (Cs)
- Francium (Fr)

2. Non-Metals with Valency 1:

These are halogens (Group 17) that have seven electrons in their outermost shell. They tend to gain one electron to achieve a stable configuration (forming -1 anions).

Examples:
- Fluorine (F)
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)
- Astatine (At)
- Tennessine (Ts)

Conclusion:

Metals with valency 1 are typically electron donors (form positive ions).
Non-metals with valency 1 are typically electron acceptors (form negative ion

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