Q221
Open questionWho designed the modern periodic table, according to which "the physical and chemical properties of elements are the periodic functions of their atomic numbers".
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Chemistry GK · all questionsPeriodic Classification of elements
Periodic Classification of elements
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Q222
Open questionModern Periodic Table . . . . . . . . based on:
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Q223
Open question. . . . . . . . the element has the lowest ionization energy?
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Q224
Open questionWho discovered that the properties of every eighth element are the same as the first element?
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Q225
Open questionWho invented the periodic table?
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Q226
Open questionThe following are special characteristics of a group of elements?
1. All these elements are metals
2. All these elements react with water to form hydrogen gas.
3. All these elements have a valence (1)
1. All these elements are metals
2. All these elements react with water to form hydrogen gas.
3. All these elements have a valence (1)
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Q227
Open questionMultiplication of equivalent weight and valency of an element is equal to . . . . . . . .
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Q228
Open questionWho is credited with classifying elements on the basis of their atomic mass?
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Q229
Open questionWhich of the following statements is true/false?
1. While moving from left to right in a period, the chemical reaction of the elements first decreases and then increases.
2. Reactivity of non metals increases when moving down the group of the periodic table.
1. While moving from left to right in a period, the chemical reaction of the elements first decreases and then increases.
2. Reactivity of non metals increases when moving down the group of the periodic table.
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Q230
Open questionWhich of the following elements could not find a definite position in Mendeleev's periodic table?
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Q231
Open questionBetween the chemical properties, Mendeleev focused on compounds made with these elements.
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Q232
Open questionWhich group in the modern periodic table includes elements that are inert gases?
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Q233
Open questionIn the modern periodic table, in which period elements of atomic numbers 11 to 14 are placed:
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Q234
Open questionIn the third period of the periodic table, the smallest element is . . . . . . . .?
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Q235
Open questionIn the modern periodic table, bromine Occurs in the . . . . . . . . period.
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Q236
Open questionWhich of the following atomic number elements have chemical properties similar to magnesium?
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Q237
Open questionWhat are the 14 elements after Actinium called?
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Q238
Open questionThe atomic numbers of the four basic elements of a period are 11, 13, 16 and 17. In the modern periodic table, atomic number of the most metallic element of these will be . . . . . . . .
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Q239
Open questionName the German chemist who grouped elements into triads in 1817.
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Q240
Open questionThe element with atomic number 57 belongs to-
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