Understanding which international scientific organisation is responsible for standardizing names, symbols, and units is important in various scientific fields, particularly chemistry and physics. This ensures clear communication and consistency globally.

International Organisation for Naming Elements and Units

The question asks to identify the specific international scientific organisation that has the authority to approve the names of elements, their symbols, and scientific units. Several international bodies exist, each with different roles and areas of focus.

Let's look at the options provided and determine which one fits the description:

• United Nations Educational, Scientific and Cultural Organization (UNESCO): UNESCO is a specialized agency of the United Nations aimed at promoting world peace and security through international cooperation in education, arts, sciences, and culture. While it supports science education and research, it does not directly approve the names of elements or units.
• International Union of Pure and Applied Chemistry (IUPAC): IUPAC is an international federation of National Adhering Organizations that represents chemists in individual countries. It is globally recognized as the authority on chemical nomenclature, terminology, measurement, and atomic weights. IUPAC is specifically responsible for the provisional and final approval of new elements and their names, as well as standardizing chemical nomenclature and related terminology and units.
• International Science Council (ISC): The ISC is a non-governmental organization with a global membership of scientific bodies (including unions and associations, and national and regional scientific organizations). Its mission is to be the global voice for science. While it promotes international scientific collaboration, it doesn't have the specific mandate to approve individual element names or units.
• International Union of Geodesy and Geophysics (IUGG): The IUGG is a non-governmental organization dedicated to promoting and coordinating studies of Earth and its environment in space. It focuses on fields like seismology, meteorology, hydrology, oceanography, and geodesy. It does not deal with the naming of chemical elements or fundamental scientific units.

Based on the roles of these organizations, the International Union of Pure and Applied Chemistry (IUPAC) is the correct body responsible for approving the names of elements, symbols, and many scientific units, especially those related to chemistry.

Therefore, the International Union of Pure and Applied Chemistry is the organization that approves the names of elements, symbols, and unit.

Revision Table: Key Scientific Organisations

Additional Information: IUPAC and Element Naming

When scientists discover a new element, they propose a temporary name and symbol. IUPAC reviews the evidence for the element's existence and then the proposed name and symbol. The process involves review by IUPAC's relevant divisions and committees. Once approved, the name and symbol are officially added to the periodic table. IUPAC also plays a crucial role in defining standard atomic weights and other chemically relevant data, as well as standardizing chemical nomenclature across various sub-disciplines of chemistry.

While IUPAC focuses heavily on chemistry-related units and nomenclature, other international bodies like the International Committee for Weights and Measures (CIPM) and its parent organization, the General Conference on Weights and Measures (CGPM), are primarily responsible for the International System of Units (SI).