No.
well technically its not a planet no more but Pluto
Mercury is not the coldest planet because it has more solar radiation than all of the other planets. This is because it is closer to the Sun. However, Mercury is not the hottest planet in the Solar System. See related question.
The coldest planet is Neptune.
The coldest planet in our solar system is Uranus.
Mercury is the closest to the sun. Pluto is the very last planet in our solar system so that's what makes it the coldest planet.
Actually Venus is the hottest planet in the solar system because of it's thick atmosphere that taps the heat below the atmosphere. Pluto is the coldest planet because it is the farthest away from the sun.
The smallest and coldest planet in our solar system is Pluto. It is a dwarf planet located on the outer edges of our solar system, and its surface temperatures can drop as low as -375 degrees Fahrenheit (-225 degrees Celsius).
Neptune is farthest from the SunUranus is the coldest planet in our solar system
The element named after the coldest planet in the solar system is "Neptunium." It is named after the planet Neptune, which is known for its icy temperatures in the outer reaches of our solar system.
mercury
Mercury is the closest planet to the sun in our solar system.
The first planet in the solar system is Mercury