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Mercury's surface has an abundance of sodium, sulfur, potassium, chlorine, and thorium. It also has lower amounts of iron. The core of Mercury is likely mostly silicon.

Mercury's core is about 42% of it's mass while Earth's core is about 17%. Mercury has a higher iron content than any other planet in our solar system. The theory behind this is that Mercury was once a larger planet but was hit by a planetesimal that stripped away most of it's surface.

Mercury's atmosphere is made up of hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor (compared to Earth's mostly nitrogen and oxygen). It's size is  about one-quadrillionth of what Earth's atmosphere is.

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The atmosphere of Venus is mostly carbon dioxide (96%) with traces of nitrogen(3.5%). Because the atmosphere is so thick, even though they have little nitrogen compared to carbon dioxide, the nitrogen abundance is still four times higher than that of Earth's atmosphere. This causes a huge greenhouse effect and that is why Venus is hotter than Mercury but further away from the sun.

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The chemical composition of Earth's crust is 46.6% oxygen, 27.7% silicon, 8.1% aluminum, 5% iron, 3.6% calcium, 2.8% sodium, 2.6% potassium, and 2.1% magnesium. The atmosphere is 78% nitrogen, 21% oxygen, 0.93% argon, 0.04% carbon dioxide.

The core of Earth is made up of 89% iron, 6% nickel, and the other 5% is possibly sulfur but other elements cannot be ruled out.

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In 1976 NASA's Viking landers carried out an experiment where they scooped up some of the soil and combined it with amino acids and other nutrients and the soil released CO2. Scientists realized for this to happen in the similar way it does on Earth, there was potentially living creatures within the soil. Other experiments failed to back this up and scientists now believe that inorganic salts caused the reactions.

The center of Mars in most likely a combination of iron, nickel and sulfur. The crust is primarily silicon, oxygen, iron and magnesium. The atmosphere is too thin to support any life and is 95% carbon dioxide. The Mars Rover has given scientists the theory that life may have once been alive on Mars due to the presence of Boron which is needed to make RNA.

Mars is roughly the same size as Earth but unlike Earth, Mars has very little presence of water.

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The atmosphere of Jupiter is 90% hydrogen with the other 10% being mostly helium. These gases pile on top of each other and form layers with no solid ground. Because of this, the "surface" of Jupiter is defined as the place where the pressure is the same as that on Earth (1 atm). The core of Jupiter has never been seen and is hard to reach. Scientists believe that the core is a metallic hydrogen or a solid rock about 18 times the size of Earth.

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Saturn is mostly hydrogen and helium with traces ammonia, methane and water. At the higher pressures closer to the center of the planet, the hydrogen becomes liquid and eventually metallic hydrogen like Jupiter but not as abundant. The planet is also not very dense and would float in a large enough sized pool of water. The rings of Saturn are mostly ice and rock pieces that refract light from the sun.

The core of Saturn most likely has rocky material at the very center.

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Most of Uranus is made up of ices, water, methane and ammonia, with the majority of it being ices. Unlike other planets, Uranus is thought to have a core of icy materials (water, methane and ammonia ices) that make up 80% of the planet. Like Saturn, Uranus also has a set of rocky rings that are less visible. The rings appear to be on the top and bottom because Uranus essentially spins on it's side due to multiple impacts.

The dull blue color of Uranus is due to the methane found in it's atmosphere. There are also traces of hydrocarbons in the atmosphere.

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The first layer of Neptune is its icy atmosphere which is mostly helium and hydrogen. The blueish color comes from traces of methane like Uranus but since it's a deeper color there are other elements present, but scientists aren't entirely sure what.  The mantle of Neptune is a water and ammonia ocean. The core is unlike the other gas giant planets, it contains iron and other metals.

The rings of Neptune are a reddish color and made up of ice particles and silicates. They also have arcs unlike other planets because of the gravitational pull from Uranus.

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Pluto's atmosphere is 90% nitrogen and 10% other molecules such as methane. This is similar to Earth, where 80% of the atmosphere is nitrogen. The complex molecules that make up the rest of the atmosphere come from radiation experienced on the planet. The interior of the planet is made of different water ice phases. Way deep inside the planet, the core is formed of heavy elements such as silicates.

Pluto has elements found on it that could be linked the the possibility of life being able to live on it including hydrocarbons and nitriles.

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