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b. 0 ; chlorine atomic number is 17 so EC-2.8.7 valency-must be 1 or 7. NCERT solutions enable students to prepare for CBSE Class 9 examination stress-free. 3. L can have maximum of 8 electrons, so, we can say it is filled completely. There is a special rule called aufbau principle (german word for 'building up'). sodium, silicon. Sodium has one electron in its outermost shell. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. Which of the following correctly represents the electronic distribution in the Mg atom? Note that when writing the electron configuration for an atom like Cu, the 3d is usually written before the 4s. An element has electronic configuration 2, 6; the element is (a) Carbon (b) Nitrogen (c) Oxygen (d) Fluorine. An electron configuration can quickly and simply tell a reader how many electron orbitals an atom has as well as the number of electrons populating each of its orbitals. 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. The atomic number of an element X is 8 and that of element Y is 4. The radioactive isotope used in the treatment of cancer is: (a) plutonium-239 (b) arsenic-74 (c) cobalt-60 (d) iodine-131. 4. How to Find Electron Configuration. Write the electronic configuration and valency of the following: (i) Chlorine (ii) Sodium and (iii) Silicon write the electronic configuration of chlorine sodium, silicon. Electron configurations describe where electrons are located around the nucleus of an atom. Predict the nature of bonding in the compound formed. Periodic Classification of Elements Chapter Wise Important Questions Class 10 Science SHORT ANSWER […] Its electronic configuration is 2, 1. NCERT Solutions , Class 9, Chemistry . Electron orbitals are differently-shaped regions around an atom's nucleus where electrons are mathematically likely to be located. Electrons enter available sublevels in order of their increasing energy. Chlorine - 2,8,7 Sodium - 2,8,1 Silicon - 2,8,6. Use the element blocks of the periodic table to find the highest electron orbital. An atom's electron configuration is a numeric representation of its electron orbitals. Class-9 » Science. Neils Bohr gave the planetary model of an atom. of electron in 3rd orbit = 16-(2+8) = 6 ( Max. If you don’t have a chart, you can still find the electron configuration. the Lewis dot structure of sodium: B: electronic configuration of boron =122221 There are 3 valence electrons in Boron atom. Key Features of NCERT Solutions for Class 9 Science Chapter 4 – Structure of The 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. In this way, you would consider the electronic configuration of oxygen to be $1s^22s^22p^4$. Class-9 » Science. To arrive at the electron configurations of atoms, you must know the order in which the different sublevels are filled. 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. Actual experimental data shows the value to be [Ar]3d 5 s 1. A sublevel is filled or half-filled before the next sublevel is entered. Capacityis 8 ) 1st orbit has only 1s orbital. writw the electronic configuration of sodium ion and chloride ion.comment aboout their chemical reactivity in comparison to the respective neutral atoms. The relation between orbital filling and the periodic table 10. Share 0. Show the formation of Na 2 O and MgO by the transfer of … At. 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. Structure of the Atom Class 9 MCQs Questions with Answers. The electron configuration can be seen as consisting of the core electrons, which is equal to the configuration of the most recent noble gas, plus the valence (outer electron) configuration of the element. 3 ; the valency of chlorine is 1 . Page No 55: Question 12: If Z = 3, what would be the valency of the element? Sodium atoms have 11 For example, the atomic number of sodium is 11. Actual configurations have not been verified. Electron Configuration • The way in which electrons are distributed among the various orbitals of an atom 8. Share 4. (i) Write the electron-dot structures for sodium (11), Oxygen (8), chlorine (17) and magnesium (12). Structure of the Atom. Q3. Distribution of Electrons in Different Orbits. Important Question for Class 10 Science Periodic Classification of Elements PDF will help you in scoring more marks.. Question 1. How to Determine Electron Configuration . According to J.J. Thomson’s model of an atom, the electrons are embedded all over in the positively charged spheres. Share with your friends. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Periodic Classification of Elements Chapter. 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. So we can say that the valence electron of Na is 1. 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. He was the first person to suggest the periodicity in the properties of the elements. 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. He was the person to describe the arrangement of electrons (electronic configuration) in different orbits/shells. 4.6 Electronic configuration (ESABE) The energy of electrons (ESABF). Copper is element No. Ans. So we can say the Valence electron for Cl is 7. Answer: By Z = 3, we mean that the atomic number of the element is 3. Electronic configuration is : Cl = 2, 8, 7 So it contains 7 valence electron. Also, na me the element. And since we have two electrons in the one s orbital, we can't fit in any more electrons. of electron in 1st orbit = 2 ( Max. Lewis dot structures reflect the electronic structures of the elements, including how the electrons are paired. When sodium is burned in a chlorine atmosphere, it produces the compound sodium chloride. Rather than writing: ... Chromium is element No. In order to achieve the nearest noble gas configuration, it gains one electron to form Chloride ion. 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. Whereas Cl has seven electrons in its outermost shell. So we could also write the electron configuration for helium right, as one s two. 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. 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. NCERT Solution for Class 9 science - structure of the atom 55 , Question 11. 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