(1) 2.Calculate the number of lines when an electron jumps from 6th level to 2nd level. (1) 3. If two discharge tubes A and B are filled with Hydrogen and oxygen respectively‚ will the electrons and gaseous cations be the same? Justify your answer. (1) 4. Which
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he is credited with the discovery and identification of the electron; and‚ in a broader sense‚ with the discovery of the first subatomic particle. Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913‚ as part of his exploration into the composition of canal rays (positive ions). He invented the mass spectrometer. J.J. Thomson discovered the electron. He found that the electron was a very small‚ negatively charged particles that are part
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tire pressures are off. The first thing that I would like to do is explain what electricity is in an automobile. Electricity is the worlds most widely used source if energy. Electricity is the flow of electrons through a conductor to eventually be used to supply a load of some sort. The electrons flow from positive to negative. In order to understand how an electric charge moves from one atom to another‚ you need to learn a little about atoms. Everything that surrounds us is made of atoms; every
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element (TRUE) 10. Models of the atom a. Plum Pudding- electrons float around in a positive charged “pudding” b. Nuclear Model- atom is mostly empty space. All the positive charge and almost all the mass is concentrated in a small area in the center‚ called the nucleus. Nucleus is composed of protons and neutrons c. Planetary- electrons orbit the nucleus like planets d. Quantum-atom is found inside a blurry electron cloud 11. Scientists – Thomson‚ Rutherford‚ Millikan‚ etc.
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electric charge in several ways. These include the quantities Current‚ Voltage and Power. Current * Current (I) is the rate of flow of Charge Carriers‚ such as electrons. Current is usually thought of as moving in the direction of positive charge‚ so from the positive power supply to the negative. However‚ since in metals it is electrons that carry electric charge‚ the actually flow is opposite to the way in which we think of it. * Current it the amount of Charge‚ Q that passes a point in
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Wolfgang Pauli & The Exclusion Principle Receiving a Nobel Prize is a very onerous award. It is usually given to scientists who have had the most amazing discovery & most scientific advancement in their chosen field of studies. Ever since the first Nobel Prize was given in 1901 there have been much more scientific advancements in physics‚ which has given way too many more Nobel Prizes given out. One of these amazing scientific advancements was The Exclusion Principle discovered by Wolfgang Pauli
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(or a group) gain or loses electrons. (It has an electric charge due to the imbalance and since they need to neutralise each other.) An ionic bond is a bond that transfers from one and another‚ resulting in an attraction between oppositely charged ions. Sodium chloride (NaCl) is a compound of a metal (Sodium) and a non-metal (Chlorine) join together‚ the sodium being positively charged and the chlorine being negatively charged. In this reaction‚ Sodium gives electrons to the Chlorine (which turns
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of one or more electrons from a metal onto a non-metal. Characteristics of both bonds: * Occur between 2 atoms * Composed of 2 electrons * Have both ionic and covalent characteristics * Together = 100% * Both bonds are measured on an electronegativity scale * Both contain a nonmetal * Chemical bonds * Are determined by using the “magic number” (1.67) * Have bond angle and bond axis Characteristics of metallic bonds: * In metals (d-block electrons only..because of
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discovered the electron. In Thomson’s "Plum Pudding Model" each atom was a sphere filled with a positively charged fluid. The fluid was called the "pudding." Scattered in this fluid were electrons known as the "plums." The radius of the model was 10-10 meters. Thomson suggested that the positive fluid held the negative charges‚ the electrons‚ in the atom because of electrical forces. Thomson’s “Plum Pudding Model is used in science‚ because it was the first model utilising electrons. He and his fellow
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from the nucleus to the valence electron gets weaker. The valence electron is loosely held and it is easy for the elctron to be released to form stable octet lectron arrangement. The reactivity of G1 is the tendency of the atom to release elctron to form stable electron arrangement. The easierm the atom releases electron‚ the more reactive it is. ELECTROPOSITIVITY The electropositivity of G1 is the tendency of the atom to release electron to form stable electron arrangement. As the size increases
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