The inner core and outer core are the two layers of earth are mainly composed of metallic elements such as nickel and iron, which are abundant in meteoroids and comets.
A chemical element is a type of atom that has a certain number of protons in its nucleus, including pure substances consisting of only that type. Unlike compounds, chemical elements cannot be broken down into simple substances by chemical reactions.
In chemistry and physics, an element is a substance that cannot be broken down into simple components by chemical reactions other than the nucleus. Elements are uniquely identified by the number of protons in the nucleus.
Elements are substances that cannot be broken down into other substances. There are about 100 elements, each with its own kind of atom.
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