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9th CBSE
IMPORTANT
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A charged particle has 16 protons, 18 electrons and 16 neutrons. The particle is:

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Important Questions on Structure of Atom

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9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 40
A particle has 12 protons, 12 neutrons and 10 electrons. The particle is:
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 41
In the elements A (atomic number 3), B (atomic number 10), C (atomic number 12), D (atomic number 13) and E (atomic number 16), the metals are
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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 42

An element whose nucleus does not contain any neutron is:

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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 43
Which amongst the following have similar chemical properties?
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IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 44
Na1124, an isotope of sodium, is used:
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Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 45
Co2760, an isotope of cobalt, is used:
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 46
C614, an isotope of carbon, is used :
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IMPORTANT
Core science chemistry>Chapter 4 - Structure of Atom>EXERCISE 4B>Q 47
Natural chlorine has two isotopes   Cl1737 and  Cl1735 in the ratio of 1:3. The average atomic mass of chlorine is: