Elements found on Earth and Mars are exactly the same.
Hydrogen is the most common element found in the universe. ...
Isotopes are atoms of the same element, with different numbers of neutrons.
In ancient times the elements referred to fire, earth, water, and air.
Is it true??
Answers
Answer:
is the rarest naturally occurring element.
Answer:
In chemistry, an element is a pure substance which cannot be broken down by chemical means, consisting of atoms which have identical numbers of protons in their atomic nuclei. The number of protons in the nucleus is the defining property of an element, and is referred to as the atomic number (represented by the symbol Z).[1] Chemical elements constitute all of the baryonic matter of the universe.
The periodic table of the chemical elements
In total, 118 elements have been identified. The first 94 occur naturally on Earth, and the remaining 24 are synthetic elements produced in nuclear reactions. Save for unstable radioactive elements (radionuclides) which decay quickly, nearly all of the elements are available industrially in varying amounts.
When different elements are combined, they may produce a chemical reaction and form into compounds due to chemical bonds holding the constituent atoms together. Only a minority of elements are found uncombined as relatively pure native element minerals. Nearly all other naturally-occurring elements appear as compounds or mixtures; for example, atmospheric air is primarily a mixture of the elements nitrogen, oxygen, and argon.
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