Chemistry

The vector stencils library "Periodic table of chemical elements" contains 119 icon symbols of chemical elements for drawing Mendeleev's periodic table, chemical diagrams, infographics and illustrations.
"A chemical element is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus. Elements are divided into metals, metalloids, and non-metals. Familiar examples of elements are carbon, nitrogen, oxygen (non-metals), silicon, arsenic (metalloids), aluminium, iron, copper, gold, mercury, and lead (metals).
The lightest chemical elements, including hydrogen, helium and smaller amounts of lithium, beryllium and boron, are thought to have been produced by various cosmic processes during the Big Bang and cosmic-ray spallation. Production of heavier elements, from carbon to the very heaviest elements, proceeded by stellar nucleosynthesis, and these were made available for later solar system and planetary formation by planetary nebulae and supernovae, which blast these elements into space. The high abundance of oxygen, silicon, and iron on Earth reflects their common production in such stars. While most elements are generally stable, a small amount of natural transformation of one element to another also occurs in the decay of radioactive elements as well as other natural nuclear processes." [Chemical element. Wikipedia]
The chemical symbols example "Design elements - Periodic table of chemical elements" was created using the ConceptDraw PRO software extended with the Chemistry solution from the Science and Education area of ConceptDraw Solution Park.
www.conceptdraw.com/ solution-park/ science-education-chemistry

This classroom floorplan example shows furniture and educational equipment layout. It was created using the ConceptDraw PRO diagramming and vector drawing software.
"A classroom or schoolroom is a room dedicated primarily to teaching or learning activities. Classrooms are found in educational institutions of all kinds, including public and private schools, home schools, corporations, and religious and humanitarian organizations. ...
For lessons that require specific resources or a vocational approach different types of classrooms both indoors and outdoors are used. This allows for learning in an authentic context that fosters the natural development of the particular vocational skill. This is known as situated learning. Classrooms can range from small groups of five or six to big classrooms with hundreds of students. A large class room is also called a lecture hall. A few examples of classrooms are computer labs which are used for IT lessons in schools, gymnasiums for sports, and science laboratories for biology, chemistry and physics. There are also small group classrooms where students learn in groups of about 7 ...
A university classroom with permanently installed desk-chairs, green chalkboards, and an overhead projector.
Most classrooms have a large writing surface where the instructor or students can share notes with other members of the class. Traditionally, this was in the form of a blackboard but these are becoming less common in well-equipped schools because of new alternatives like flipcharts, whiteboards and interactive whiteboards. Many classrooms also have TVs, maps, charts, Pencils, books, monographs and LCD projectors for presenting information and images from a computer." [Classroom. Wikipedia]
The Classroom furniture and equipment layout plan example is included in the School and Training Plans solution from the Building Plans area of ConceptDraw Solution Park. www.conceptdraw.com/ solution-park/ building-school-training-plans