Definitions and MCQs of Ninth Class Chemistry (Atomic Structure)


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Definitions and MCQs of Ninth Class Chemistry (Atomic Structure)

  1. 1. Chapter 3Atomic Structure(Neither take rest nor be the time waste,Because life is the test and only heaven isthe rest)Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  2. 2.  Definitions1. Atom: -The building block of the matter thattakes part in the reaction.ORThe smallest component of an element havingthe chemical properties of the element,consisting of a nucleus and surrounding shells.2. Nucleus: -the central part of the atomcomprising the mass of the atom conferred byprotons and neutrons, initially discovered byRUTHERFORD.3. Shell or energy level: -according to Bohr theseare the circular orbits at certain distance fromthe nucleus where electrons exist.4. Atomic number (Z): -The number of protons innucleus is called the atomic number of theelement.5. Atomic mass: - The total number of protonsand neutrons in nucleus constitute its atomicmass.6. Element: -The simplest matter whose all atomshave same atomic number and can not be furthersimplified is called element.7. Crook’s discharge tube experiment: -indicates the existence of protons and electronsin the atomChemistry Def. & MCQs Dr. Sajid Ali Talpur
  3. 3. 8. Cathode rays: -the rays which consist ofelectrons and are produced when the current ispassed through gases at low pressure are calledcathode rays.9. Properties of cathode rays (electrons):Discovered by J.J THOSMSON Carry a negative charge equal to 1.6*10-19C=4.803*10-10 Their e/m ratio is 1.76*108C/g Their mass is 9.11*10-31kg = 0.00055a.m.u They can be deflected by electromagnetic field. These don’t depend upon the material of whichthe electrode is made nor of the gas which isenclosed inside the tube.10. The properties of canal rays ( protons): GOLDSTIEN discovered them. These rays carry positive charge They travel in straight line The value of e/m depends upon the gas enclosed The mass is 1.67*10-27kg=1.0073amu They are composed of heavy particles thanelectrons.11. The properties of neutrons: Discovered by CHADVICK. They are neutral, carrying no charge. The mass is same as that of proton but slightlyheavier. i.e. 1.0087 a.m.u. It is highly energetic particle.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  4. 4. 12. Radioactivity: -the spontaneous emission ofradiations by certain elements is calledradioactivit13. Isotopes: - Atoms of the same elements, havingthe same atomic number but the different atomicmasses are called isotopes.14. Spectrum: -the band of colors formed throughthe dispersion of light is called spectrum.15. Electronic configuration: - the arrangement ordistribution of electrons in the available orbitalsis called electronic distribution.16. Atomic radius: -the half of the bond length,taken between two homonuclear diatomicmolecules. OR the distance from nucleus to thevalence electron is called atomic radius.17. Ionic radius: -the radius of an ion.18. ion: -the charged atom is called ion19. Cation: -the positively charged ion is calledcation.20. Anion: -the negative charged ion is calledanion.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  5. 5. 21. Ionization potential: -the energy required tomake an atom ion is called ionization potential.22. Electron affinity: -the amount of energyreleased when an electron is added to a neutralgaseous atom to form a negative ion is calledelectron affinity.23. Electronegativity: - the force with witch anatom attracts the shared pair towards itself iscalled electronegativity.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  6. 6.  Multiple Choice Questions1. The first atomic theory was proposed by:a) Democritus b) Greek Philosophersc) both a & b d) John Dalton2. According to modern theory, all elements aremade up of small, indivisible, indestructibleparticles called atomsa) true b) false3. Protons and neutrons were discovered byrespectively:a) J.J Thomson, Chadwickb) Chadwick, J.J Thomsonc) Goldstein, Chadwickd) Chadwick, Goldstein4. Electrons are the constituent of all matter.a) true b) false5. The incorrect statement regarding the cathoderays is:a) material particlesb) e/m ratio is differentc) possess K.Ed) N.O.T6. Electrons do not depend upon the the nature ofthe cathode and the gas inside the tube.a) true b) falseChemistry Def. & MCQs Dr. Sajid Ali Talpur
  7. 7. 7. e/m ratio of electron is:a) 1.76*108C/g b)1.76*1011C/gc) 1.602*10-19C/g d) 1.672*10-27C/g8. The Charge on electron is:a) 1.76*108C b)1.76*1011Cc) 1.602*10-19C d) 1.672*10-27C9. The charge on proton is:a) 1.76*108b)1.76*1011Cc) 1.602*10-19C d) 1.672*10-27C10. 1 a.m.u =?a) 1.76*108g b)1.76*1011gc) 1.602*10-19g d) 1.672*10-27g11. Atom was proved divisible particle by:a) cathode rays b) radioactivityc) discharge tube exp. d) A.O.T12. Electron is 1836 times heavier than proton.a) true b) false13. Radioactivity was discovered by:a) Henry Bequeral b) Rutherfordc) Bohor d) J.J Thomson14. Rutherford used particles in his experiment.a) α – particles b) β – particlesc) γ – particles d) A.O.TChemistry Def. & MCQs Dr. Sajid Ali Talpur
  8. 8. 15. The α-particles deflected back by striking theatom because of the presence of:a) shells b) nucleusc) protons d) electrons16. Energy is …… when an electron jumps fromhigher energy level to lower energy level.a) absorbed b) releasedc) neither absorbed nor releasedd) both a & b17. This of the following particles takes part in thereaction.a) electron b) protonc) neutron d) A.O.T18. The correct equation is:a) E2 - E1 = hυ b) E2 + E1 = hυc) E2 * E1 = hυ d) E2 / E1 = hυ19. Na has:a) 11 electrons b) 11 protonsc) 12 neutrons d) A.O.T20. Mass number =a) protons + electronsb) protons + neutronsc) electrons + neutronsd) no. of protons.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  9. 9. 21. Atomic number =a) protons + electronsb) protons + neutronsc) electrons + neutronsd) no. of protons.22. The positively charged particles in radioactivityare protons.a) true b) false23. Isotopes have different number of:a) electrons b) protonsc) neutrons d) A.O.T24. Proteum has one proton and no neutron.a) true b) false25. Isotopes are used in the treatment of diseases.a) true b) false26. The formula to find out max number ofelectrons is:a) n2 b) 2nc) 2n2 d) N.O.T27. When n=3 the max electrons in a shell shouldbe.a) 3 b) 6c) 9 d) 1828. The max. number of electrons in 4thshell is:a) 4 b) 8c) 16 d) 32Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  10. 10. 29. Find the mis matcha) electrons : J.J Thomsonb) protons : nucleusc) neutrons : atomic massd) protons : atomic number30. The correct statement is:a) A = Z+A b) A=Z-Nc) A=N-Z d) Z=A-N31. Which isotope of oxygen forms ozonea) O16 b) O17c) O18 d) O19Answer Key1 D 2 B 3 C4 A 5 A 6 B7 A 8 C 9 C10 D 11 B 12 B13 A 14 B 15 A16 B 17 B 18 A19 D 20 B 21 D22 C 23 A 24 A25 A 26 C 27 D28 D 29 A 30 D31 CChemistry Def. & MCQs Dr. Sajid Ali Talpur
  11. 11. By the same Author: How to be successful? Definitions of chemistry terms Definitions of Physics terms Definitions and MCQs onbranches of Biology Ninth Class Chemistry MCQs Ninth Class Biology MCQs Scientific Biological ReasonsChemistry Def. & MCQs Dr. Sajid Ali Talpur
  12. 12.  Definitions, Scientific Reasonsand MCQs on Chemistry Skeletal muscles PhysiologyBCQs How to achieve heaven? Themechanism of goodness andbadness Biology MCQs test for entrytest Chemistry MCQs test for entrytest Cardiovascular system anatomyquiz Lower limb anatomy quiz Lower limb Anatomy MCQsChemistry Def. & MCQs Dr. Sajid Ali Talpur
  13. 13.  Spiritual successful lifequotations Why should one love the ProphetMuhammad (s.a.w) Quotations on the ProphetMuhammad (s.a.w) The origin and future of humanlife Endocrinology – Hormones MCQs Islam, science, success andwisdom quotesChemistry Def. & MCQs Dr. Sajid Ali Talpur