Oxygen (O)
* Physical: Colorless, odorless gas at room temperature. Highly reactive.
* Chemical: Highly electronegative, readily forms oxides with most elements. Essential for respiration in animals.
Nitrogen (N)
* Physical: Colorless, odorless, and inert gas at room temperature. Makes up the largest portion of the atmosphere.
* Chemical: Less reactive than oxygen. Forms important compounds like ammonia and nitrates, essential for plant growth.
Carbon (C)
* Physical: Solid at room temperature. Exists in various allotropes, including diamond and graphite.
* Chemical: Forms the backbone of organic molecules, including carbohydrates, fats, and proteins.
Boron (B)
* Physical: Solid at room temperature. Found in various crystalline forms.
* Chemical: A metalloid, exhibiting both metallic and nonmetallic properties. Used in high-strength alloys and ceramics.
Key Differences:
* Electronegativity: Oxygen is the most electronegative, followed by nitrogen, then carbon, and finally boron.
* Reactivity: Oxygen is the most reactive, followed by nitrogen, then carbon, and boron is relatively less reactive.
* Physical States: Oxygen and nitrogen are gases at room temperature, carbon is a solid, and boron is a solid metalloid.
* Types of Compounds Formed: Oxygen forms oxides, nitrogen forms nitrides, carbon forms a vast array of organic compounds, and boron forms borides.
In conclusion, oxygen, nitrogen, carbon, and boron are distinct elements with very different physical and chemical properties due to their varying atomic structures and electron configurations.
