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प्रश्न
Distinguish between:
Group 17 - Group 18
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उत्तर
| Sr. No. | Group 17 | Group 18 |
| 1. | Elements of group 17 are called halogens. | Elements of group 18 are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons, except helium, which contains 2 electrons. |
| 3. | Their valency is 1. | Their valency is zero. |
| 4. | They form diatomic molecules with the general formula (X2). | They are monoatomic gases under normal conditions. |
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संबंधित प्रश्न
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How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
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Write the merits of the modern periodic table over Mendeleev’s Periodic table
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where should hydrogen be placed in the modern periodic table? Give reason for your answer.
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The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
(a) P
(b) Q
(c) R
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(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
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(i) A and D
(ii) C and D
(iii) A and B
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(a) number of valence electrons
(b) valency
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(d) name of the element
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Name the type of elements which have two outermost shell incomplete.
Name the type of elements which have one electron short of octet.
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Give the symbol and valency of the following element and radical.
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Give the symbol and valency of the following element and radical.
Hydroxide
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Write an explanation.
Period
Write a scientific reason.
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______ group elements are called alkaline earth metals.
An element has the atomic number 12.
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Name the metalloids in the first twenty elements.
