A, C and E are not inert gases. What Is The Electron Configuration Of Potassium The number of electrons for the K atom are 19 electrons. “Bohr atomic model” forms the basis of the electronic structure of an atom. Selina ICSE Solutions for Class 9 Chemistry Chapter 8 The Periodic Table. Therefore number of electrons = 19. The electron configuration of an atom can be written as the numbers of electrons in each shell, separated by a comma. ... Write the electronic configuration of element ... and the colour of the flame of potassium is pale violet. Electronic configuration It is defined as “Arrangement of electrons in different shells.” The arrangement is according to Bohr bury rule that is 2n2. The electron configurations of the first 20 elements. E electronic configuration 2, 8, 8, 1 . Distribution of Electrons in Different Orbits. C electrons 13, neutrons 14 . Hence, the electronic configuration of potassium is 2,8,8,1 and not 2,8,9. Hope this clears your doubt. Each element has a unique atomic structure that is influenced by its electronic configuration, which is the distribution of electrons across different orbitals of an atom. The number of electrons in each shell in atomic structure is N e =2n 2 So, the 3rd shell can have a maximum number of electrons of 18. Neils Bohr gave the planetary model of an atom. Page No. Ans: No shell can accommodate more than 8 electrons being outermost shell. 79. There are 118 elements in the periodic table. B electronic configuration 2, 8, 8 . 2. Explain. State (i) valency of each element (ii) which one is a metal (iii) which is a non-metal (iv) which is an inert gas. D Protons 18 neutrons . Electronic configuration of Potassium (K) Atomic number of potassium = 19. Valence shell It is the last shell of an atom. Thus, electronic configuration of potassium is . Electron Configuration Chart for All Elements in the Periodic Table. The electronic configuration of calcium is 2, 8, 8, 2. and not 2,8,9,1 because, L shell can accommodate maximum 8 electrons and not 9. Q. Explain. … A is a non-metal. Class 9 CBSE Test paper Solved Chapter 3: Structure of atoms - 6 1. Number of orbit in potassium = 4 He was the person to describe the arrangement of electrons (electronic configuration) in different orbits/shells. He was the first person to suggest the periodicity in the properties of the elements. Electronic configuration 2, 8, 8 Valency of B = Zero Element C has 13 electrons Electronic configuration = 2, 8, 3 Valency of C = 3 Element D Protons = 18 = Electrons = 2, 8, 8 Valency of D = Zero Element E Electronic configuration = 2, 8, 8, 1 Valency of E = 1; C and E are metals. Since, maximum number of electrons in outermost orbit will not be more than 8, thus the 19 th electron of potassium atom will reside in 4 th orbit. Click images to preview the worksheet for this lesson and the Year 9 Chemistry Workbook (PDF and print versions) the first two electrons will go in the 1s orbital. Question 9(a) Name the first three alkaline earth metals. That's why Sodium, Na is 2.8.1 and Magnesium, Mg is 2.8.2 Why isn't Potassium, K 2.8.9 but 2.8.8.1(a total of … Atomic number = 7 = Number of electrons = 2, 5. The electronic configuration of potassium (K) is 2,8,8, 1 instead of 2,8,9 though the M shell can accommodate up to 18 electrons. For example, in the case of Sodium, the electronic configuration is 2,8, 1. Electrons are not accommodated in a given shell unless the inner shells are filled. (CBSE 2014) Answer: M-shell cannot have more than 8 electrons in case it happens to be outermost or valence shell in an atom. Solution: (i) Element A. The electronic configuration of potassium (K) is 2, 8, 8, 1 instead of 2, 8, 9 though the M shell can accommodate up to 18 electrons. Since 1s can only hold two electrons the next 2 electrons for Potassium go in the 2s orbital. Q.
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