The atomic number of an element is 17
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1
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3743
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September 22, 2016
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Four elements P, Q, R and S have atomic numbers 12,13,14 and 15 respectively
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1
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13546
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September 22, 2016
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State the Modern Periodic Law
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1
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1138
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September 22, 2016
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Consider the table given below and answer the following questions:
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1
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3233
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September 22, 2016
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Three elements A, B and C have atomic number 7,8 and 9 respectively
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1
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5982
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September 22, 2016
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The elements of the second period along with their atomic number in parentheses are given below:
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1
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2715
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September 22, 2016
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How and why does the size of an atom vary on moving from left to right in a period?
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1
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1975
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September 22, 2016
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What is meant by periodicity in properties of elements with reference to the periodic table?
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1
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9364
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September 22, 2016
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Table given below shows a part of the Periodic Table:
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1
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4260
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September 22, 2016
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Explain how the tendency of metallic character changes from left to right across the period
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0
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1053
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September 22, 2016
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The electronic configuration of 4 elements A, B, C and D is as given under:
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1
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1961
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September 22, 2016
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The atomic number of K and Ca is 19 and 20 respectively and they belong to the same period
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1
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3290
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September 22, 2016
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Identify the element that have two completely filled shells and the number of valence electrons in each are as:
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1
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1581
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September 22, 2016
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How does electropositivity of elements gets affected as we move:
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1
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2505
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September 22, 2016
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Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modem periodic table:
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1
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12401
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September 22, 2016
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Predict which of the following will form anions and which will form cations
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1
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4608
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September 22, 2016
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Justify the following statements:
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1
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2516
|
September 22, 2016
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What is meant by 'group' in the modem periodic table?
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1
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601
|
September 22, 2016
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The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively
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1
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2480
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September 22, 2016
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The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3 and 4 respectively of the modem periodic table
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1
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3517
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September 22, 2016
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What is meant by electronegativity of elements ? How does it vary across a period in the periodic table ? Give reason
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0
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946
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September 22, 2016
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Na, Mg, Al and P belong to 3rd period but are placed in first, second, thirteenth and fifteenth group
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1
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2412
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September 22, 2016
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Atomic radius of hydrogen is 37 pm. Express it in metres
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1
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4155
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September 22, 2016
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Three element X,Y and Z belongs to 17th group but to 2nd, 3rd and 4th period respectively
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1
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2789
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September 22, 2016
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"Elements in Periodic Table show periodicity of properties." List any four such properties
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0
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4375
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September 22, 2016
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Mention any two trends exhibited by elements when we go from left fo right across the period of periodic table
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0
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2378
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September 22, 2016
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Write the trend of atomic size and metallic character along a group and a period in the modem periodic table
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0
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3446
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September 22, 2016
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State Modem Periodic Law
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1
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433
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September 22, 2016
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The following table shows elements represented by the letters A, B, C, D, E, F, G and H
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1
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3492
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September 22, 2016
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Two elements M and N belong to group I and II respectively and are in the same period of the periodic table
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1
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4400
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September 22, 2016
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