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Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus. The Rutherford–Bohr model of the hydrogen atom (Z = 1) or a hydrogen-like ion (Z > 1). In this model, it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron ...
Lý Thường Kiệt (李 常 傑; 1019–1105), real name Ngô Tuấn (吳 俊), was a Vietnamese general and admiral of the Lý dynasty. [1] He served as an official through the reign of Lý Thái Tông, Lý Thánh Tông and Lý Nhân Tông and was a general during the Song–Lý War. In Vietnamese history, he helped invade Champa (1069 ...
Lithium (from Ancient Greek λίθος (líthos) 'stone') is a chemical element; it has symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid element. Like all alkali metals, lithium is highly reactive and flammable, and must be stored in vacuum ...
Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23 Na. The free metal does not occur in nature and must be prepared from compounds. Sodium is the sixth most abundant element in the Earth's crust and exists in numerous minerals such as feldspars, sodalite, and halite (NaCl).
A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. Photons are massless particles that always move at the speed of light ...
Lý Thái Tổ (chữ Hán: 李 太 祖, 8 March 974 – 31 March 1028), personal name Lý Công Uẩn, temple name Thái Tổ, was a founding emperor of Lý dynasty and the 6th ruler of Đại Việt; he reigned from 1009 to 1028.
I tend to use this a lot with my friends and family for basic things like, ‘I only fly Delta.’ ‘Oh wow you’re so boujee.’”. Sometimes this word can also be used ironically to describe ...
Edition. The original 15-volume version of Đại Việt sử ký toàn thư or the Hồng Đức edition (1479), that was named after the era name of Lê Thánh Tông, only existed in form of handwritten manuscript and hence is only partially preserved to this day. The Đại Việt sử ký tục biên or the Cảnh Trị edition (1665), that ...