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A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases: a new row is begun when chemical behavior begins to repeat, meaning that elements with similar behavior fall into ...
Google Classroom is a free blended learning platform developed by Google for educational institutions that aims to simplify creating, distributing, and grading assignments. The primary purpose of Google Classroom is to streamline the process of sharing files between teachers and students. [ 3] As of 2021, approximately 150 million users use ...
The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [ 5] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...
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Distance education, also known as distance learning, is the education of students who may not always be physically present at school, [ 1][ 2] or where the learner and the teacher are separated in both time and distance. [ 3] Traditionally, this usually involved correspondence courses wherein the student corresponded with the school via mail.
Five Tanner stages of male genitalia; The Adolescent Period In males, testicular enlargement is the first physical manifestation of puberty (and is termed gonadarche ). [ 30 ] Testes in prepubertal males change little in size from about 1 year of age to the onset of puberty, averaging about 2–3 cm in length and about 1.5–2 cm in width.
Due to the COVID-19 pandemic, many schools across the world began conducting classes via videotelephony software such as Zoom, Google Classroom and/or Google Meet. The Organisation for Economic Co-operation and Development has created a framework to guide an education response to the COVID-19 pandemic for distance learning. [216]
A period on the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, elements in the same group (column) have similar chemical and physical properties, reflecting the periodic law.