Carbon monoxide and carbon dioxide have

3. different chemical properties and the same physical properties

Physical properties:  

Chemical properties:

Therefore, option 3 is correct.

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different chemical properties and the same physical properties

Explanation:

Both carbon monoxide and carbon dioxide are gases.

So physically, the two compounds have no fixed shape and volume and their molecules are far apart.

Therefore, they have similar physical properties.

Based on chemical properties, the compounds or molecules given are different.

They will combine chemically in diverse ways.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the answers would be

the first one and the second one