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Chemistry 9 Chapter 2 Structure of Atom -3
1.
When the electron is present in a particular orbit, it?
a) absorbs energy
b) emitts energy
c) none of these
d) does not radiate energy
2.
Carbon has the atomic number 6 and atomic mass 12, how many electrons would be present in its outermost energy level?
a) 8
b) 2
c) 4
d) 7
3.
Chlorine has the atomic number 17 and mass number 35, how many neutrons are present in its nucleus?
a) 17
b) 18
c) 8
d) 35
4.
Who proposed the atomic model of an atom for the first time?
a) Rutherford
b) Bohr
c) Max Plank
d) Plato
5.
Atoms of an element with same atomic number but different mass number are known as?
a) isomers
b) atomic mass units
c) isotopes
d) sub atomic particles
6.
Isotopes differ in the number of?
a) electrons
b) all of these
c) neutrons
d) protons
7.
Who used the word isotope for the first time?
a) Soddy
b) Bohr
c) Rutherford
d) Max plank
8.
Isotope is a?
a) Arabic word
b) English word
c) Latin word
d) Greek word
9.
Which one of the following is an isotope of hydrogen?
a) deuterium
b) protium
c) tritium
d) all of these
10.
How may isotopes hydrogen have?
a) 2
b) 5
c) 3
d) 4
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