الرئيسية » Simplified Chemistry (صفحه 16)

Simplified Chemistry

الثابت العام للغازات R= 0.0821

الثابت العام للغازات : و يرمز له بالرمز R و هو ثابت فيزيائي يستخدم في دراسة خواص الغازات ، ويدخل في عدد كبير من القوانين الفيزيائية المتعلقة بحالة نظام من الغاز من حيث تأثير تغيير حالته عن طريق رفع درجة الحرارة أو الضغط او أنتروبية النظام.   ما هي قيمة …

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Electron affinity

Electron affinity It is the amount of energy given out when an electron is added to a neutral gaseous atom. This results in the formation of an anion. For example Cl + e– → Cl + energy. The electron affinity of chlorine is 348 kJ mol-1. Electron affinity changes across …

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Ionization energy

Ionization energy (or potential) of an element is defined as “The amount of energy required or needed to remove an electron from the neutral gaseous atom to form unipositive ion , for example Na → Na+ + e– + energy This is measured in electron volts per atom or kJ …

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Quantum numbers

Quantum numbers: These are numbers which are used to specify the location and energy of an electron and size, shape and orientation of the orbital to which a particular electron belongs. Principal or total quantum number (n): This quantum number is identical with that used in Bohr Sommer field theory. …

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Bohr’s model of the atom

Bohr’s model of the atom Neil Bohr in 1913 observed that basic features of Rutherford’s atomic model namely presence of nucleus and revolving electrons were correct but that the electrons revolved round the nucleus in certain allowed circular orbits and that the electrons did not radiate and therefore its energy …

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