class 9 chemistry structure of atom practice sheet

 Class IX Chemistry

 Chapter 4: Structure Of Atom 

 Q 1. Complete that following information. Element Representation Number of electrons Number of protons Number of neutrons Atomic Number Mass Number Polonium 209 84Po 84 ----- 125 84 209 Calcium ----- 20 20 20 20 40.

 Ans1.____________________________________________ 

Q 2. Will 35Cl and 37Cl have different valencies? Justify your answer. Ans2._______________________________________________________ ____________________________________________________________

 Q 3. An element X has a mass number 9 and atomic number.

Ans 3.____________________________________________

Q 4. Write the valency of this element?

 Ans

________________________________________ ____________________________________________________________ ____________________________________________________________ 

Q 5. Write the atomic number and the symbol of an element which has mass number 32 and the number of neutrons 16 in the nucleus. 

Ans 5 ._______________________________________________________ ____________________________________________________________ 

 Q 6. In the atom of element X, 6 electrons are present in the outermost shell. If it requires an octet configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed? Ans 6._______________________________________________________ 

Q 7.Why do helium, neon & argon have a zero valency? 

Ans 7._______________________________________________________ ____________________________________________________________ 

 Multiple Choice Questions

 Q 1. The notation of carbon is. (a) 6C12 (b)7C14 (c) 4C9 (d)1C1

 Q 2. Atomic number of calcium and argon are 20 and 18 respectively. The mass number of both the atoms is 40. The name given to them is: (a) Isotopes (b) Isobars (c) Isotones (d) Valency 

Q 3. The maximum number of electrons which can be accommodated in Pshell is: (a) 2 (b) 18 (c) 72 (d) 32

 Q 4. If Z=3, the valency of element = 1, the name of the element is: (a) Sodium (Na) (b) Lithium (Li) (c) Potassium (K) (d) Hydrogen (H)

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