Q181
Open questionThe first and third members of the Dobereiner triad are phosphorus and antimony, the second member of this triad is-
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Chemistry GK · all questionsPeriodic Classification of elements
Periodic Classification of elements
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Q182
Open questionIdentify the element that does not belong to the following group.
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Q183
Open questionWhich element has the highest electron affinity in halogens?
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Q184
Open questionWhich of the following is the minimum electronegative element?
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Q185
Open questionThe reactivity of non-metals within a group in the Periodic Table
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Q186
Open questionMatch List I and List II.
| List-I | List-II |
| a. Elements in group I A | 1. Inert gas |
| b. Elements in group zero | 2. Alkali metal |
| c. Elements of d-block | 3. Inner-transiti on element |
| d. Elements of f-block | 4. Transition element |
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Q187
Open questionThe fourth and fifth period has-
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Q188
Open questionSelect the Element which does not belong to the following group:
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Q189
Open questionWhat are the vertical columns present in the modern periodic table?
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Q190
Open questionWhat does the term periodicity mean?
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Q191
Open questionIn the modern periodic table, period . . . . . . . . and . . . . . . . . does not contain any metalloids.
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Q192
Open questionHow many elements were known when Mendeleev began his work?
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Q193
Open questionThe element with the highest first ionization potential is . . . . . . . .
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Q194
Open questionWhat do Lithium, Sodium and Potassium have in common?
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Q195
Open questionWhich of the following elements was the last element in Newland's law of octaves?
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Q196
Open questionThe element of the lanthanide sereis with atomic number 58 is . . . . . . . .
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Q197
Open questionIn the modern periodic table, which two periods have 8 elements each?
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Q198
Open questionHow many groups and periods exist in the modern Periodic table?
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Q199
Open questionWhat are the elements of group -1 of the modern periodic table?
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Q200
Open questionWhat is the specialty of rare earth elements?
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