Why Venus is the hottest planet instead of Mercury?

because venus is full of CO₂ which  traps the heat from the sun and does not let go back easily while on the other side mercury does not trap heat in compared to venus..

Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).
This causes it to heat up to very high temperatures, higher than that of Mercury. 


Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn't stay hot.
For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600°C. 


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because it ahs more co2 

 Venus has clouds of gases which trap the heat of the sun.

hope this helps!!!

Venus is the hottest planet because there are many active volcanoes on th surface of this planet and there are many clouds of acids which trap the heat of the sun and brought acid rains on the planet. please thumbs up this answer.

Venus has the densest atmosphere of all the terrestrial planets in the Solar System, consisting of mostly carbon dioxide so the green house effect is maxium  there therefore it is the hottest planet. 

Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.Venus has a thick atmosphere of pale, yellow clouds of carbon dioxide and sulfuric acid. The clouds and the gases in them (mostly the CO₂) trap the heat and prevent it from escaping to space (The Greenhouse effect).This causes it to heat up to very high temperatures, higher than that of Mercury.Mercury on the other hand has no atmosphere to trap heat. So a lot of the incident radiation is reflected away and it doesn 't stay hot.For instance, if you step from the sunlit side to the dark side of Mercury, the temperature drops by about 600ï½C.