Page No 55: Question 12: If Z = 3, what would be the valency of the element? Electron configurations describe where electrons are located around the nucleus of an atom. At. 3 ; the valency of chlorine is 1 . When sodium is burned in a chlorine atmosphere, it produces the compound sodium chloride. How to Determine Electron Configuration . 24, and according to the Aufbau principle, the electron configuration should be [Ar]3d4s2. This has a high melting point (800 ºC) and dissolves in water to to give a conducting solution. 10 ; View Full Answer And valency of the following: chlorine. He was the person to describe the arrangement of electrons (electronic configuration) in different orbits/shells. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Periodic Classification of Elements Chapter. 9. Lewis Dot Structure. Sodium atoms have 11 For example, the atomic number of sodium is 11. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. So one s two is the electron configuration for helium. Structure of the Atom. Actual experimental data shows the value to be [Ar]3d 5 s 1. Also, na me the element. When their electron configurations are added to the table (Figure 6.29), we also see a periodic recurrence of similar electron configurations in the outer shells of these elements. Gist of Lesson for Quick Revision (By JSUNIL) Question: If an element A is a member of group 14, write the formulae of its chloride and oxide. And once again what that means, is we're talking about an s orbital, s orbital in the first energy level, and there are two electrons in that s orbital. Electron orbitals are differently-shaped regions around an atom's nucleus where electrons are mathematically likely to be located. NCERT solutions enable students to prepare for CBSE Class 9 examination stress-free. 0 ; chlorine atomic number is 17 so EC-2.8.7 valency-must be 1 or 7. Actual configurations have not been verified. 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. Another important point to note, is that the filling of electrons in subshells doenst actually fill from low to high. So we can say that the valence electron of Na is 1. 7 ; atomic no. NCERT Solutions , Class 9, Chemistry . Electronic configuration is : Cl = 2, 8, 7 So it contains 7 valence electron. The electron configuration states where electrons are likely to be in an atom. Sodium has one electron in its outermost shell. To arrive at the electron configurations of atoms, you must know the order in which the different sublevels are filled. For example, the electron configuration of lithium, 1s²2s¹, tells us that lithium has two electrons in the 1s subshell and one electron in the 2s subshell. Hence, the valency of the element is 1 (since the outermost shell has only one electron). 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. Periodic classification class 10 Questions from: Summative Assessment – II In 1789, Lavoisier first attempted to classify the elements into two divisions namely Metals and Non-metals. Whereas Cl has seven electrons in its outermost shell. Ans. Sodium chloride is an ionic compound, and the crystalline solid has the structure shown on the right. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. He was the first person to suggest the periodicity in the properties of the elements. The relation between orbital filling and the periodic table 10. b. of electron in 3rd orbit = 16-(2+8) = 6 ( Max. Show the formation of Na 2 O and MgO by the transfer of … There is a special rule called aufbau principle (german word for 'building up'). Which of the following correctly represents the electronic distribution in the Mg atom? 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. Lewis dot structures are commonly referred to as electron dot structures or Lewis structures. Copper is element No. Share 0. In order to achieve the nearest noble gas configuration, it gains one electron to form Chloride ion. An element has electronic configuration 2, 6; the element is (a) Carbon (b) Nitrogen (c) Oxygen (d) Fluorine. Structure of the Atom. Share 4. Calculations and electronic configurations have been explained in detail while solving. How to Find Electron Configuration. For example, the atomic number of sodium is 11. Lewis dot structures reflect the electronic structures of the elements, including how the electrons are paired. Share with your friends. Question 1. The atomic number of an element X is 8 and that of element Y is 4. Electron Configuration • The way in which electrons are distributed among the various orbitals of an atom 8. If your periodic table doesn’t agree with this, your answers for elements near the f-orbitals may be slightly different. Note that when writing the electron configuration for an atom like Cu, the 3d is usually written before the 4s. Neils Bohr gave the planetary model of an atom. Class-9 » Science. Lewis defined a base as an electron pair donor and an acid as an electron pair acceptor. Elements near the f-orbitals may be slightly different their chemical reactivity in comparison to the neutral. 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