Atomic Elements
Atomic Elements - Related Videos
01:27
Elements and Compounds
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2026
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.ElementsElements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...
01:33
Atomic Structure
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2026
All matter is composed of atoms, the smallest individual units of elements. Each atom is made up of three subatomic particles: protons, neutrons, and electrons. Together, these three particles account for the mass and the charge of an atom.The History of Atomic TheoryThe first person to propose that everything on Earth is made up of tiny particles was the Greek philosopher Democritus, around 450 B.C. He used the term atomos, Greek for “indivisible,” from which the modern term “atom” is derived.
01:52
Atomic Mass
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2020
Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are...
04:00
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...
02:31
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)...
FAQs
Atomic behavior in bonding and reactivity is governed largely by the arrangement of electrons in an atom, with valence electrons having the strongest direct influence. These outer electrons help determine how an element interacts with others and what kinds of chemical bonds or compounds it can form. Consequently, electron arrangement provides a basis for explaining observed chemical behavior.
Patterns in atomic radius, ionization energy, and electronegativity allow chemists to compare elements systematically rather than treating each substance as isolated. These recurring trends connect atomic structure with the ease of electron-related interactions and with likely bonding behavior. Using them, chemists can anticipate differences in reactivity and compound formation before testing a particular combination experimentally.
Isotopes belong to the same element but differ in neutron number, so they introduce atomic variation without changing the element’s identity as established by proton number. Recognizing this distinction helps chemists describe samples more precisely and separate questions about an element’s chemical behavior from questions about its isotopic composition. This precision is important when interpreting atomic data.
A practical approach begins by locating the relevant elements, examining their positions and recurring trends, and then considering electron arrangement, especially the valence electrons. Chemists use this information to propose how the elements may interact and what compounds could result. The prediction is not a substitute for investigation, but it gives a structured starting point for explaining or testing chemical reactions.
Selection depends on the behavior required from the resulting substance or reaction. Chemists compare elemental trends and electron arrangements to identify components suited to bonding, reactivity, or other chemical interactions. This reasoning supports material selection and industrial catalysis, where understanding how elements participate in reactions can guide choices intended to promote a desired chemical process.
Elemental analysis provides a common framework across biological function, industrial catalysis, and environmental change. In each setting, chemists examine how electron arrangement, periodic trends, and interactions among elements affect compounds or reactions. The same principles therefore support different goals, from explaining chemical behavior in living systems to selecting materials and interpreting changes in the environment.