MCQ Structure of the Atom Chapter 4 Class 9 Science Advertisement MCQ’s For All Chapters – Science Class 9th 1. The neutral sub-atomic particle was discovered byRutherfordBohrJ.ChadwickThomsonQuestion 1 of 152. Neutron hasPositive chargeNegative chargeNo chargeBoth chargesQuestion 2 of 153. Neutrons are present in the nucleus of all atoms exceptHydrogenHeliumOxygenCarbonQuestion 3 of 154. The mass of an atom is mainly due toElectronsNucleusOrbitalsEmpty spaceQuestion 4 of 155. The distribution of electrons in orbits is given byThomson and BohrBohr and BuryRutherford and BohrDalton and ThomsonQuestion 5 of 156. The maximum number of electrons in a shell is given by the formulan²2n²n³3n²Question 6 of 157. The first shell (K) can hold a maximum of1 electron2 electrons4 electrons8 electronsQuestion 7 of 158. The L shell can hold a maximum of4 electrons6 electrons8 electrons10 electronsQuestion 8 of 159. The outermost shell can have a maximum of2 electrons6 electrons8 electrons18 electronsQuestion 9 of 1510. Shells are filledRandomlyStep-wise from inner to outerFrom outer to innerIn any orderQuestion 10 of 1511. The electrons in the outermost shell are calledNeutronsValence electronsProtonsCore electronsQuestion 11 of 1512. An atom with 8 electrons in the outermost shell hasHigh reactivityValency zeroValency eightHalf-filled shellQuestion 12 of 1513. The tendency of atoms to achieve 8 electrons in their outermost shell is calledOctet rulePairing ruleNucleus ruleStability ruleQuestion 13 of 1514. Atoms achieve octet bySharingLosingGaining electronsAll of theseQuestion 14 of 1515. The valency of sodium is0123Question 15 of 15 Loading...
very good test but some i got doubt i got clarification