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Each chemical element has a unique atomic number (Z— for "Zahl", German for "number") representing the number of protons in its nucleus. [4] Each distinct atomic number therefore corresponds to a class of atom: these classes are called the chemical elements. [5] The chemical elements are what the periodic table classifies and organizes.
The Board conducts examination twice a year and the number of students appearing for the main examination is around 1,400,000 for Higher Secondary Certificate (HSC) and 1,700,000 for Secondary School Certificate (SSC) every year. [2]
The syllabus for the State Board School Examinations (Sec.) & Board of Higher Secondary Examinations, Tamil Nadu (SBSEBHSE) varies depending on the class and stream (Science, Commerce, Arts).
Prepared and isolated from urine, it was the first element whose discovery date and discoverer are recorded. [53] Its name first appears in print in the work of Georg Kaspar Kirchmayer in 1676. Recognised as an element by Lavoisier. [1] 1 Hydrogen: 1671 R. Boyle: 1671: R. Boyle: Robert Boyle produced it by reacting iron filings with dilute acid.
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Because of the COVID-19 pandemic, after a lot of speculation and considerations, the concerned authority decided not to arrange a HSC or equivalent examination for the year 2020. Results from two prior exams, JSC and SSC, were averaged and used as the score. [9] In 2021, the date and subjects of HSC exam were revised to abridge for the first time.
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Consistently ranked as one of the nation's top schools academically, it was ranked seventh in the state based on Higher School Certificate (HSC) results in 2020. [4] [5] Established in 1958, the school caters for approximately 730 students from Year 7 to Year 12, who are accepted on an academic basis. [3]