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प्रश्न
Name the metalloids in the first twenty elements.
उत्तर
B (Boron), Si (Silicon).
संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Give the symbol and valency of the following element and radical.
Nitrate
Group 1 and 2 : s block : : group 13 and 18 : _______
To the left of the zig-zag line in the periodic table are the metal elements.
Which of the following is the outermost shell for elements of period 2?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Match the atomic number with the following:
A rare gas.
