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Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

Lattice Centering and Coordination Number

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...

Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates

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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
When a particle moves relative to an inertial frame, the equations of motion can be expressed using rectangular components. If the motion is confined to the x-y plane, the equations having the x and y coordinates only can be used to simplify the mathematical representation.
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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.

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Constructing and Visualizing Models using Mime-based Machine-learning Framework

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A Coordinated Research Agenda for Nature-Based Learning.

Cathy Jordan^1,2, Louise Chawla³

¹Pediatrics and Extension, University of Minnesota, Minneapolis, MN, United States.

Frontiers in Psychology

|May 9, 2019

Summary

Nature-based learning (NBL) shows promise for children's development. This research agenda outlines key questions to advance understanding and practice in NBL for improved educational and personal outcomes.

Keywords:

academic outcomes children environmental stewardship nature-based learning personal development research agenda

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Area of Science:

Environmental Education
Developmental Psychology
Educational Research

Background:

Growing evidence suggests nature-based learning (NBL) positively impacts children's educational and developmental outcomes.
There is a need to establish a clear research agenda to guide future NBL studies and practices.

Purpose of the Study:

To outline a research agenda for nature-based learning (NBL).
To identify key research questions and methodological improvements for the NBL field.
To inform practice and policy decisions regarding NBL.

Main Methods:

A literature review was conducted.
Input was gathered from researchers, practitioners, and funders.
A collaborative process was used to set the research agenda.

Main Results:

Recommendations for research questions focusing on NBL's impact on learning, development, and causal mechanisms.
Identification of practical questions regarding teacher preparation and adoption of NBL.
Exploration of NBL's potential to mitigate socioeconomic disadvantages and its cost-effectiveness.

Conclusions:

Further research is needed to understand how, why, and for whom nature contact enhances learning and development.
The proposed agenda aims to increase the relevance and rigor of NBL research.
This research agenda will guide effective NBL implementation in diverse settings.