1. WHAT IS QUANTUM THEORY ANSWER: QUANTUM THEORY, also quantum mechanics, in physics, a theory based on using the concept of the quantum unit to describe the dynamic properties of subatomic particles and the interactions of matter and radiation. The foundation was laid by the German physicist Max Planck, who postulated in 1900 that energy can be emitted or absorbed by matter only in small, discrete units called quanta. Also fundamental to the development of quantum mechanics was the... QUANTUM THEORY, also quantum mechanics, in physics, a theory based on using the concept of the quantum unit to describe the dynamic properties of subatomic particles and the interactions of matter and radiation. The foundation was laid by the German physicist Max Planck, who postulated in 1900 that energy can be emitted or absorbed by matter only in small, discrete units called quanta. Also fundamental to the development of quantum mechanics was the uncertainty principle, formulated by the German physicist Werner Heisenberg in 1927, which states that the position and momentum of a subatomic particle cannot be specified simultaneously.. 2. Three fundamental particles of matter: ANSWER: . Three fundamental particles of matter: A. Proton - a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. A spin of ½, and a mass of 1.673 × 10− 27kg. Symbol: P. B. Neutrons - neutral elementary particle with a rest mass of 1.674 92716 × 10 –27 kilogram and spin 1/2 ; classified as a baryon. In the nucleus of an atom it is stable, but when free it decays. C. Electrons - stable elementary particle present in all atoms, orbiting the nucleus in numbers equal to the atomic number of the element in the neutral atom; a lepton with a negative charge of 1.602 176 462 × 10 –19 coulomb, a rest mass of 9.109 381 88 × 10 –31.*Proton - is a subatomic particle with the symbol p or p+ and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom.Has a mass of approximately 1.672×10−27 kg.(negative 27 is an exponent), or 938 MeV/c2, of which the rest mass of its three valence quarks contributes only about 9.4 MeV/c2. *Electron - is a subatomic particle with a negative elementary electric charge.Has a mass of approximately 9.109×10−31 kilograms, or 5.489×10−4 atomic mass units (negative 31 is an exponent along with negative 4). *Neutron - is a subatomic hadron particle that has the symbol n . Neutrons have no net electric charge and a mass slightly larger than that of a proton. 3). Determine the number of protons,neutrons, and electrons of the following species. ANSWER: . A. Magnesium no. of protons: 12 no. of neutrons: 12 no. of electrons: 12 B Scandium no. of protons: 21 no. of neutrons: 24 no. of electrons: 21 C Zirconium no. of protons: 40 no. of neutrons: 51 no. of electrons: 40 D Silver no. of protons: 47 no. of neutrons: 61 no. of electrons: 47
Posted on: Thu, 21 Aug 2014 13:01:17 +0000
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