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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 ...
Indonesian Arabic (Arabic: العربية الاندونيسية, romanized: al-‘Arabiyya al-Indūnīsiyya, Indonesian: Bahasa Arab Indonesia) is a variety of Arabic spoken in Indonesia. It is primarily spoken by people of Arab descents and by students ( santri ) who study Arabic at Islamic educational institutions or pesantren .
For example, any atom that contains 11 protons is sodium, and any atom that contains 29 protons is copper. Atoms with the same number of protons but a different number of neutrons are called isotopes of the same element. Atoms are extremely small, typically around 100 picometers across. A human hair is about a million carbon atoms wide.
Fission is a form of nuclear transmutation because the resulting fragments (or daughter atoms) are not the same element as the original parent atom. The two (or more) nuclei produced are most often of comparable but slightly different sizes, typically with a mass ratio of products of about 3 to 2, for common fissile isotopes.
Along with the religion of Islam, the Arabic language, Arabic number system and Arab customs spread throughout the entire Arab caliphate. The caliphs of the Arab dynasty established the first schools inside the empire which taught Arabic language and Islamic studies for all pupils in all areas within the caliphate. The result was (in those ...
Helium-3 (3 He [1] [2] see also helion) is a light, stable isotope of helium with two protons and one neutron. (In contrast, the most common isotope, helium-4, has two protons and two neutrons.) Helium-3 and protium (ordinary hydrogen) are the only stable nuclides with more protons than neutrons. It was discovered in 1939.
Nitrogen tribromide (NBr 3), first prepared in 1975, is a deep red, temperature-sensitive, volatile solid that is explosive even at −100 °C. Nitrogen triiodide (NI 3) is still more unstable and was only prepared in 1990.
Because the Quran is written in Arabic and all Islamic terms are in Arabic, millions [83] of Muslims (both Arab and non-Arab) study the language. Software and books with tapes are an important part of Arabic learning, as many of Arabic learners may live in places where there are no academic or Arabic language school classes available.