1) na₂o bond type: ionic 2) co₂ bond type: covalent 3) o₂ bond type: covalent 4) c₂h₆ bond type: covalent

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# Brief Explanations:
- For $Na_2O$: Sodium ($Na$) is a metal and oxygen ($O$) is a non - metal. Metals tend to lose electrons and non - metals tend to gain electrons. In $Na_2O$, sodium donates electrons to oxygen, forming $Na^+$ and $O^{2 -}$ ions. The electrostatic attraction between these ions forms an ionic bond.
- For $CO_2$: Carbon ($C$) and oxygen ($O$) are both non - metals. Non - metals share electrons to achieve a stable electron configuration. In $CO_2$, carbon shares electrons with two oxygen atoms to form covalent bonds ($O = C=O$).
- For $O_2$: Oxygen is a non - metal. Two oxygen atoms share electrons with each other ($O=O$) to form a covalent bond as they need to complete their valence shell electron configuration.
- For $C_2H_6$: Carbon and hydrogen are non - metals. Carbon - carbon ($C - C$) and carbon - hydrogen ($C - H$) bonds are formed by sharing of electrons. In $C_2H_6$ ($H_3C - CH_3$), all bonds are covalent.

# Answer:
1. Ionic
2. Covalent
3. Covalent
4. Covalent

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