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. Class-9 » Science. You can refer to NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. Note that when writing the electron configuration for an atom like Cu, the 3d is usually written before the 4s. the Lewis dot structure of sodium: B: electronic configuration of boron =122221 There are 3 valence electrons in Boron atom. 0 ; chlorine atomic number is 17 so EC-2.8.7 valency-must be 1 or 7. 24, and according to the Aufbau principle, the electron configuration should be [Ar]3d4s2. So the electron configuration of calcium (Ca) which has 20 electrons, can be written as: [Ar]4s². Lewis defined a base as an electron pair donor and an acid as an electron pair acceptor. So we can say the Valence electron for Cl is 7. Actual experimental data shows the value to be [Ar]3d 5 s 1. Important Question for Class 10 Science Periodic Classification of Elements PDF will help you in scoring more marks.. Hence, the valency of the element is 1 (since the outermost shell has only one electron). Another important point to note, is that the filling of electrons in subshells doenst actually fill from low to high. Its electronic configuration is 2, 1. 4.6 Electronic configuration (ESABE) The energy of electrons (ESABF). For example, the atomic number of sodium is 11. The electronic configuration of an atom can be predicted from its atomic number. Lewis Dot Structure. How to Determine Electron Configuration . Class –XI–CBSE ... electronic configuration of sodium 1 2222631 There is only one valence electron in an atom of sodium. The radioactive isotope used in the treatment of cancer is: (a) plutonium-239 (b) arsenic-74 (c) cobalt-60 (d) iodine-131. To arrive at the electron configurations of atoms, you must know the order in which the different sublevels are filled. Diagrams have been used wherever necessary to be able to learn visually. 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. Electronic configuration is : Cl = 2, 8, 7 So it contains 7 valence electron. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. write the electronic configuration of chlorine sodium, silicon. The relation between orbital filling and … There is a special rule called aufbau principle (german word for 'building up'). writw the electronic configuration of sodium ion and chloride ion.comment aboout their chemical reactivity in comparison to the respective neutral atoms. Share 4. Electron configurations describe where electrons are located around the nucleus of an atom. 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. In order to achieve the nearest noble gas configuration, it gains one electron to form Chloride ion. And since we have two electrons in the one s orbital, we can't fit in any more electrons. In this way, you would consider the electronic configuration of oxygen to be $1s^22s^22p^4$. When sodium is burned in a chlorine atmosphere, it produces the compound sodium chloride. Chlorine - 2,8,7 Sodium - 2,8,1 Silicon - 2,8,6. 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. Sodium has one electron in its outermost shell. Number of Sulphur = 16 No. 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. So we can say that the valence electron of Na is 1. b. (i) Write the electron-dot structures for sodium (11), Oxygen (8), chlorine (17) and magnesium (12). Also, na me the element. An element has electronic configuration 2, 6; the element is (a) Carbon (b) Nitrogen (c) Oxygen (d) Fluorine. If your periodic table doesn’t agree with this, your answers for elements near the f-orbitals may be slightly different. Which of the following correctly represents the electronic distribution in the Mg atom? Write the electronic configuration and valency of the following: (i) Chlorine (ii) Sodium and (iii) Silicon According to J.J. Thomson’s model of an atom, the electrons are embedded all over in the positively charged spheres. 2. 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. Show the formation of Na 2 O and MgO by the transfer of … The electron configuration states where electrons are likely to be in an atom. 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. Rather than writing: ... Chromium is element No. NCERT Solutions , Class 9, Chemistry . Sodium atoms have 11 For example, the atomic number of sodium is 11. An atom's electron configuration is a numeric representation of its electron orbitals. 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. Electron orbitals are differently-shaped regions around an atom's nucleus where electrons are mathematically likely to be located. Use the element blocks of the periodic table to find the highest electron orbital. Question 1. Predict the nature of bonding in the compound formed. 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. So one s two is the electron configuration for helium. Whereas Cl has seven electrons in its outermost shell. The next element, sodium would be the same with one additional electron in the 3s orbital. of electron in 2nf orbit = 8 ( Max. Share 0. NCERT solutions enable students to prepare for CBSE Class 9 examination stress-free. Lewis dot structures reflect the electronic structures of the elements, including how the electrons are paired. Therefore the expected electron configuration for Copper will be 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 9. sodium, silicon. Neils Bohr gave the planetary model of an atom. of electron in 3rd orbit = 16-(2+8) = 6 ( Max. 4. Copper is element No. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Periodic Classification of Elements Chapter. Share with your friends. L can have maximum of 8 electrons, so, we can say it is filled completely. 3. Capacityis 8 ) 1st orbit has only 1s orbital. Capacity is 2 ) No. He was the person to describe the arrangement of electrons (electronic configuration) in different orbits/shells. Q3. So we could also write the electron configuration for helium right, as one s two. Capacity is 8 ) No. 3 ; the valency of chlorine is 1 . 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