Chemistry 9th Class English Medium Unit 8 Online Test With Answers

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Chemistry 9th Class English Medium Unit 8 Online Test

Sr. # Questions Answers Choice
1 Group nuebr tells about the Number of shells Number of valence electrons Both a and b None of these
2 Atomic number of actinium is 57 60 89 80
3 Actinide series starts after the element Actinium Lanthanum Osmum Silver
4 Atomic number of lanthanum is 57 58 59 60
5 Lanthanide series starts after the elemetn Osmium Actinium Lanthanum None of these
6 Actinidws belong to period. 4th 5th 6th 7th
7 Elements with atomic no .58 to 71 are called. Actinides Lanthanides Both a and b None of these
8 Whcih element is presnet in 2nd period. Lithium Beryllium Boron All of these
9 Second and third periods are called 1st transition series Normal periods 2nd transiion series 3rd transiliton serios
10 Which of the following elemens is presnet in 1st period. Hydrogen Helium Both a and b None of these
11 The elementss of group 1 and 2 are placed in which block s p d f
12 Elments re classified into four blocks depending upon Shell Atomic mass Sub -Shell Atomic Number
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