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

(1, 5, 10), (2, 8, 10), (2, 15, 16)

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(1, 6, 5), (2, 10, 8), (2, 16, 15)

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(1, 5, 11), (2, 8, 18), (3, 15, 31)

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None of the above

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Solution

The correct option is D None of the above
Valency is the combining capacity of one element with the other. If the number of valence electrons is 1, 2, 3, 4 then the valency is the same as the number of electrons.

If the number of electrons is more than 4 then the valency is 8-(no. of outermost electrons). The electronic configuration of X is 2, 3. The electronic configuration of Y is 2, 6. The electronic configuration of Z is 2, 8, 5. The atomic number is the number of protons and the mass number is the sum of both protons and neutrons.

X

Y

Z

Valency (no. of electrons in outer shell that can be lost)

3

2

3, 5

Atomic no.(no. of protons)

5

8

15

Mass no.(sum of protons and neutrons)

11

18

31

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Similar questions

Q. Simplify:
(i)

\frac{11}{12} \div (\frac{5}{9} \times \frac{18}{25})

(ii)

(2 \frac{1}{2} \times \frac{8}{10}) \div (1 \frac{1}{2} + \frac{5}{8})

(iii)

\frac{15}{16}

(\frac{5}{6} - \frac{1}{2}) \div \frac{10}{11}

(iv)

\frac{9}{8} \div \frac{3}{5}

(\frac{3}{4} + \frac{3}{5})

(v)

\frac{2}{5} \div {\frac{1}{5} o f [\frac{3}{4} - \frac{1}{2}] - 1}

(vi)

(1 \frac{3}{4} \times 3 \frac{1}{7}) - (4 \frac{3}{8} \div 5 \frac{3}{5})

Q. Which of the following dataset are organised?

Data 1 :- {2 , 5 , 61 , 21 , 11 ,15}
Data 2 :- {12 , 5 , 6 , 10 , 11 ,15}
Data 3 :- {2 , 5 , 6 , 16 , 11 ,15}
Data 4 :- {2 , 5 , 6 , 10 , 11 ,15}

Q. Find the first quartiles for the following data.

8, 11, 20, 10, 2, 17, 15, 5, 16, 15, 25, 6, 5

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.

Question 2
The distance (in km) of 40 engineers from their residence to their place of work were found as follows:
$\begin{matrix} 5 & 3 & 10 & 20 & 25 & 11 & 13 & 7 & 12 & 31 19 & 10 & 12 & 17 & 18 & 11 & 31 & 17 & 16 & 2 7 & 9 & 7 & 8 & 3 & 5 & 12 & 15 & 18 & 3 12 & 14 & 2 & 9 & 6 & 15 & 15 & 7 & 6 & 12 \end{matrix}$
Construct a grouped frequency distribution table with class size 5 for the data given above taking the first interval as 0-5 (5 not included). What main feature do you observe from this tabular representation?

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	X	Y	Z
Valency (no. of electrons in outer shell that can be lost)	3	2	3, 5
Atomic no.(no. of protons)	5	8	15
Mass no.(sum of protons and neutrons)	11	18	31