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Valency

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Question 27
What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.

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Solution

$\begin{matrix} A t o m i c N u m b e r & M a s s N u m b e r & V a l e n c y X & 5 & 11 & 3 Y & 8 & 18 & 2 Z & 15 & 31 & 3, 5 \end{matrix}$

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Q. Question 27
What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form.

Q. What information do you get from the following figures about the valency, atomic number and mass number of atoms X, Y and Z?

Q. Answer the following
A. Whati is the difference in the atomic models of Thomson and Rutherford ?
B. What is meant by valency of an element ? what is the relationship between the number of valence electron and valency ?
C. What is meant by atomic mass number ? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.
D. what is meant by subatomic particle ? give brief information of three subatomic particles with refrence to electrical charge, mass and location.

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Give only 1 valency and atomic mass for 1 elements.

Q. A certain nucleus A (mass number 238 and atomic number 92) is radioactive and becomes a nucleus (mass number 234 and atomic number 90) by the loss of a particle. (b) Explain how you arrived at your answer.

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