Chemical Elements
Chemical Elements - Related Videos
02:31
Elements: Chemical Symbols and Isotopes
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2020
A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain). Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
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Periodic Classification of the Elements
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2020
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
02:52
Chemical Formulas
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2020
A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural. Molecular Formula The molecular formula represents a molecule or a chemical compound using chemical symbols (to indicate the...
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Chemical Equations
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2020
Chemical equations represent the identities and relative quantities of substances involved in a chemical reaction. The substances undergoing reaction are called reactants, and their formulas are placed on the left side of the equation. The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation. Plus signs (+) separate individual reactant and product formulas, and an arrow (→) separates the reactant and product (left and right)...
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Classification of Elements and Compounds
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2020
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units. Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
FAQs
Electron arrangement determines how an element participates in biological chemistry because it governs the formation of covalent, ionic, and other chemical bonds. Those bonding patterns influence which reactions occur and how atoms combine into water, proteins, nucleic acids, and lipids. Consequently, atomic structure links elemental properties to cellular structure and metabolism.
Trace elements matter because a biological system may need them for specific biochemical functions even though they are not presented as the main structural or metabolic materials. Iron, zinc, and iodine illustrate this specialized role. This distinction helps biology connect individual elemental requirements with cellular function and recognize why imbalances can matter.
Bonding gives elements a way to participate in larger biological structures rather than acting as isolated components. Covalent, ionic, and other chemical bonds contribute to the formation of molecules, and the resulting molecules support functions represented by water, proteins, nucleic acids, and lipids. Examining bonds therefore connects atomic behavior with biological organization.
These elements receive particular attention because they support cellular structure and metabolism, two broad requirements of living systems. Considering them together helps explain how biological molecules are assembled and how cells obtain or use chemical resources. Their importance is therefore tied directly to biological structure and metabolism.
Elemental knowledge helps relate what organisms require to the chemical basis of biological balance. In nutrition, it focuses attention on elements needed for cellular structure, metabolism, or specific biochemical functions. In homeostasis, the same perspective helps explain how biological systems maintain appropriate chemical conditions and why disruptions may affect biological function.
Their chemical properties and bonding behavior influence reactions, while biological molecules formed from them participate in cellular processes. This makes elemental chemistry relevant to energy transfer. The same framework also helps interpret disease-related chemical imbalances by linking altered elemental conditions to biological consequences, without treating every imbalance as identical.