Question Text
Question 1 :
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
Question 2 :
Element X forms a chloride with the formula $XCl_2$, which is solid with a high melting point. X would most likely to be in the same group of the periodic table as
Question 3 :
What property do all elements in the same column of the Periodic Table as fluorine have in common?
Question 4 :
Which element has twice as many electrons in its second shell as in its first shell ?
Question 5 :
An atom has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar ?
Question 6 :
What is the order of atomic size of elements of group 17?
Question 7 :
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In the above table, what kind of ion will A form?
Question 10 :
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In the above table, how is the reactivity of C as compared to A?