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

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