Both Jovian planets and Terrestrial planets share a similar amount of characteristics.
For example, Jovian planets are gaseous, large and farthest from the sun.
While Terrestrial planets are rocky, dense, closest to the sun and small (in comparison to Jovian planets).
The two planets with the most similarities are Venus and Earth hence them being called "sister planets" due to to their similar masses.
Of what we have found most are the size of Jupiter or larger. But we know many more extrasolar planets exist that we simply cannot detect. If we were to draw hypotheses on what planets are most abundant they would either be similar to dwarf planets. Or, if the reader does not view dwarf planets as true planets then planets the size of ones in the terrestrial zone like: Mercury, Venus, or Earth. Are probably the most abundant.
Most of the planets are named after Greek and/or Roman gods.
The two most important elements on the Jovian planets are hydrogen and heliumn
The 4 smallest planets are also the 4 most inner planets: Mercury, Venus, Earth and Mars.
The reason that most extrasolar planets are found close to their parent stars is that the amount and frequency of the star's motion are both higher in these planets.
Calcium shares the most characteristics with magnesium.Both belongs to 2nd group of alkaline earth metals.
calcium
calcium
They are Unicellular.
Sillicon
chlorine (Cl)
potassium (K)
The elements most similar to neon are the other noble gases in group 18. They include Helium, Neon, Argon, Krypton, Xenon, and Radon.
They are generally colder.
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Copper, gold, and silver are the choices that represent a group of elements with common characteristics. All of these elements are metals.
Palladium is a rare silvery whit lustrous metal. It is a member of the Platinum Group of elements and shares characteristics with other members of that group. Because palladium is a siderophile (iron loving) element most of it was incorporated in Earth's nickel iron core shortly after the planets formation. Because the surface rocks are depleted in platinum group elements the worlds important commercial sources of them are thought to be derived from either mantle sources or from meteorites. The most important commercial sources are nickel-copper deposits found in the Sudbury Basin,Ontario, the Norilsk-Talnakh deposits in Siberia, and the Bushveld Igneous Complex in South Africa.