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Elements: Chemical Symbols and Isotopes

Elements: Chemical Symbols and Isotopes

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)...

Isotopes

Isotopes

Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.
An element's atomic mass, or weight,...

Classifying Matter by Composition

Classifying Matter by Composition

Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...

Elements and Compounds

Elements and Compounds

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
Elements 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...

Periodic Classification of the Elements

Periodic Classification of the Elements

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...

Key Elements for Plant Nutrition

Key Elements for Plant Nutrition

Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...

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Related Experiment Video

Updated: Jan 25, 2026

High Precision Zinc Isotopic Measurements Applied to Mouse Organs

High Precision Zinc Isotopic Measurements Applied to Mouse Organs

Published on: May 22, 2015

Elemental Composition Determinations Using the Abundant Isotope.

Robert B Cody¹, Thierry Fouquet²

¹JEOL USA, Inc., 11 Dearborn Rd., Peabody, MA, 01960, USA. cody@jeol.com.

Journal of the American Society for Mass Spectrometry

|May 8, 2019

Summary

Determining elemental composition can be challenging using the lightest isotope. This study presents a new method utilizing abundant isotopes for more reliable elemental analysis.

Keywords:

Elemental compositions Halogenated Isotope Organometallic Software

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Author Spotlight: Technologies and Challenges in Elemental Analysis of Food Samples

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Published on: December 22, 2023

Area of Science:

Analytical Chemistry
Mass Spectrometry
Isotope Analysis

Background:

Elemental composition is typically determined using the monoisotopic peak, often the lightest isotope.
Identifying the monoisotopic peak can be problematic for complex molecules like organometallics or polyhalogenated compounds due to weak or absent signals.

Purpose of the Study:

To introduce an alternative method for elemental composition determination.
To overcome limitations associated with identifying the lightest isotope peak.

Main Methods:

Utilizing the abundant isotope for elemental composition analysis.
Developing a novel approach for mass spectrometry data interpretation.

Main Results:

Demonstrated the feasibility of using abundant isotopes for elemental composition.
Provided a robust alternative when monoisotopic peaks are unreliable.

Conclusions:

The proposed method offers a viable alternative for elemental composition determination.
This approach enhances the reliability of mass spectrometry analysis for challenging sample types.