distinguish between elements and compounds
Answers
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ELEMENTS -
⏩It consists of only one kinds of atoms.
⏩Element cannot be broken into two or more simpler substances by physical or chemical means.
⏩An element is a pure chemical substance made of same type of atom.
⏩An element is represented using symbols.
⏩An atom is the smallest unit that shows all the properties of an element. For example, an atom of iron shows all the properties of that metal.
COMPOUNDS -
⏩It consists of two or more elements that are chemically combined in a fixed proportion.
⏩The components of a compound cannot be separated by chemical and electrochemical methods.
⏩A compound contains atoms of different elements chemically combined together in a fixed ratio.
⏩A compound is represented using a formula.
⏩A compound is made up of the same type of molecules. For example, water contains only molecules of water.
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Answer:
Element
A chemical element is a pure substance that consists of one type of atom. Each atom has an atomic number, which represents the number of protons that are in the nucleus of a single atom of that element. The periodic table of elements is ordered by ascending atomic number.
The chemical elements are divided into the metals, the metalloids, and the non-metals. Metals, typically found on the left side of the periodic table, are:
often conductive to electricity
malleable
shiny
sometimes magnetic.
Aluminum, iron, copper, gold, mercury and lead are metals.
In contrast, non-metals, found on the right side of the periodic table (to the right of the staircase), are:
typically not conductive
not malleable
dull (not shiny)
not magnetic.
Examples of elemental non-metals include carbon and oxygen.
Metalloids have some characteristics of metals and some characteristics of non-metals. Silicon and arsenic are metalloids.
Compound
Pure samples of isolated elements are uncommon in nature. While the 98 naturally occurring elements have all been identified in mineral samples from the Earth’s crust, only a small minority of them can be found as recognizable, relatively pure minerals. Among the more common of such “native elements” are copper, silver, gold, and sulfur. Carbon is also commonly found in the form of coal, graphite, and diamonds. The noble gases (e.g., neon) and noble metals (e.g., mercury) can also be found in their pure, non-bonded forms in nature. Still, most of these elements are found in mixtures.
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl). Water is another example of a chemical compound. The two or more component elements of a compound can be separated through chemical reactions.
Chemical compounds have a unique and defined structure, which consists of a fixed ratio of atoms held together in a defined spatial arrangement by chemical bonds. Chemical compounds can be:
molecular compounds held together by covalent bonds
salts held together by ionic bonds
intermetallic compounds held together by metallic bonds
complexes held together by coordinate covalent bonds.
Pure chemical elements are not considered chemical compounds, even if they consist of diatomic or polyatomic molecules (molecules that contain only multiple atoms of a single element, such as H2 or S8).
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