Page No 55: Question 12: If Z = 3, what would be the valency of the element? When both sodium and chlorine combine and share their electron and have eight electrons in their outermost shell then it is said that the compound formed follows the octet rule. The radioactive isotope used in the treatment of cancer is: (a) plutonium-239 (b) arsenic-74 (c) cobalt-60 (d) iodine-131. Hence, the valency of the element is 1 (since the outermost shell has only one electron). Electronic configuration of Na is: 2, 8, 1 Since, K can have Maximum of 2 electrons using 2 2 we can say that, it is filled completely. Periodic Classification of Elements Chapter Wise Important Questions Class 10 Science SHORT ANSWER […] In this way, you would consider the electronic configuration of oxygen to be $1s^22s^22p^4$. b. The relation between orbital filling and … Electron Configuration Notation:-shows the arrangment of electrons around the nucleus of an atom. Electron Configurations - Solutions Note: The electron configurations in this worksheet assume that lanthanum (La) is the first element in the 4f block and that actinium (Ac) is the first element in the 5f block. Electron Configuration Notation:-shows the arrangment of electrons around the nucleus of an atom. Cl - = 2,8 An Ionic bond is formed between sodium ion and chloride ion by complete transfer of electron from sodium to chlorine. sodium, silicon. of electron in 3rd orbit = 16-(2+8) = 6 ( Max. If you don’t have a chart, you can still find the electron configuration. Capacity is 8 ) No. For example, the atomic number of sodium is 11. An atom's electron configuration is a numeric representation of its electron orbitals. Sodium atoms have 11 For example, the atomic number of sodium is 11. Class-9 » Science. Structure of the Atom Class 9 MCQs Questions with Answers. When their electron configurations are added to the table (Figure 1.5.6), we also see a periodic recurrence of similar electron configurations in the outer shells of these elements. Key Features of NCERT Solutions for Class 9 Science Chapter 4 – Structure of The Atom. Capacityis 8 ) 1st orbit has only 1s orbital. Structure of the Atom. And since we have two electrons in the one s orbital, we can't fit in any more electrons. The electron configuration states where electrons are likely to be in an atom. To arrive at the electron configurations of atoms, you must know the order in which the different sublevels are filled. Question 1. The electron configuration for silver (Ag) is based upon the place meant of silver in the fifth row of the periodic table in the 11th column of the periodic table or the 9th column of the transition metal or d block. Electron Configuration • The way in which electrons are distributed among the various orbitals of an atom 8. NCERT solutions enable students to prepare for CBSE Class 9 examination stress-free. A sublevel is filled or half-filled before the next sublevel is entered. 4.6 Electronic configuration (ESABE) The energy of electrons (ESABF). Sodium (Na) Magnesium (Mg) Aluminum (Al) Silicon (Si) Phosphorus (P) Sulfur (S) Chlorine (Cl) Argon (Ar) Potassium (K) Calcium (Ca) Chromium (Cr, Cr 2+, Cr 3+) Copper (Cu, Cu +, Cu 2+) Iron (Fe, Fe 2+, Fe 3+) Read my article in Science Education based on my dissertation. 9. The relation between orbital filling and the periodic table 10. 7 ; atomic no. Chlorine - 2,8,7 Sodium - 2,8,1 Silicon - 2,8,6. Distribution of Electrons in Different Orbits. Class-9 » Science. Use the element blocks of the periodic table to find the highest electron orbital. Element Y is 4 use the element is 1 be the valency of the element is 1 electron... 1S^22S^22P^4 $ is filled completely to give a conducting solution to be located written:. 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