Mercury is the closest planet to the Sun, then why Venus is hotter than Mercury?

Mercury
Mercury is the closeset planet to the sun, but it doesn't have an atmosphere to trap the heat from the Sun. As a result, the temperature rises to 427^oC at noon, and drops down to -173^oC at night.

Venus
Venus has the thickest atmosphere (97% Carbondioxide) in the solar system, causes a severe greenhouse effect, that is it traps heat from the Sun. The temperature on Venus is 461^oC, and it remains same in day and night, because of large amount of heat trapped by the atmosphere. Hence, the atmosphere of venus makes it the hottest planet in the solar system.