Chemistry Class 9 Chapter 3 Important Question Answers 9th Class Chemistry Periodic Table and Periodicity of Properties Q: How do you find the Group number of the periodic table elements? Trick to find Periodic Table Elements Group number Group Number = Number of valence electron Q: What is the electron arrangement of an element with …
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Class 9 Chemistry 1st Chapter Important Short Questions What do moles mean in chemistry? In chemistry, a mole, sometimes spelled mol, is a standard scientific unit for measuring huge amounts of very small entities like atoms, molecules, and other defined particles. or A mole is the mass of a substance that contains 6.023 x 1023 particles …
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Chemistry Class 9 Chapter 2 Structure of Atoms Important Question SLO Based Federal Board Chemistry slo fbise Class 9 Important Question/Answers Q. What were the observations of Rutherford’s experiment? Answer: Rutherford atomic model Diagram Rutherford’s Gold Foil Experiment Rutherford scattering experiment conclusion Q. What does Rutherford’s model explain? Ans. It explains that an atom is …
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What is meant by valence electrons? The electrons present in the outermost shell or orbit or energy level of an atom are known as valence electrons. A valence electron is also known as the outermost shell electron. Example of Valence Electrons Number of Valence electrons in Sodium Atom The sodium atom has only one valence …
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Trick to determine the Period of the periodic table elements You can determine an element’s period number if you are provided its atomic number. For Example: A substance with the atomic number 6 The atomic number 6 substance is a carbon (C) and its electron configuration is 1s22s22p2. Check out !! Chemistry Class 9 Chapter …
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Atomic number of an element is 6 . Write down the electronic configuration of that element. The electronic configuration of the element atomic number (Z ) = 6 is Carbon (C). With a total of six electrons, carbon is the sixth element. The first two electrons will be placed in the 1s orbital when writing …
Determine the Group of the Periodic Table Elements Trick to find Periodic Table Elements Group number Group Number = Number of valence electrons We must understand a few guidelines to determine the group: (number of valence electrons + 10).for groups.Example: S(16) – 2,8,6Group = no. of valence electrons+ 10 = 6+ 10 = 16 3. …
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What is Periodic Table in Simple Words? ANSWER Periodic Table A periodic table is a table in which the elements are arranged according to their rising atomic number and recurrent chemical characteristics. They are arranged in a tabular format with rows denoting periods and columns denoting groups. Periods In the periodic table, the horizontal rows …
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Shell and Subshell Simple Explanation What is a shell in chemistry? SHELLS Electrons revolve around the nucleus in a particular circular pattern known as the shell of an atom. The electron shell is also known as orbit or energy level. Shell Representation It is denoted by n. Where n is any positive integer. Each shell …
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