CBSE 10th Standard Science Subject Periodic Classification of Elements HOT Questions 2 Mark Questions With Solution 2021
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CBSE 10th Standard Science Subject Periodic Classification of Elements HOT Questions 2 Mark Questions With Solution 2021
10th Standard CBSE
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Reg.No. :
Science
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Predict the group of an element A if its atomic number is 16.
(a) -
What is the probable formula of the oxide of the Silicon?
(a) -
If an element is in group 7 or VIIA, is it likely to be metallic or non-metallic nature?
(a) -
An element A belongs to group II and another element B belongs to group 15 of the periodic table.
(a) What is the number of valence electrons in A and B?
(b) What is the valency of A and B?(a) -
The atomic number of three elements X, Y and Z are 5, 7 and 10 respectively.
(a) Which element belongs to group IIIA?
(b) To which period do these elements belong?
(c) Which element belongs to VA?
(d) Which element belongs to zero group?(a)
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CBSE 10th Standard Science Subject Periodic Classification of Elements HOT Questions 2 Mark Questions With Solution 2021 Answer Keys
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The electronic configuration of the element A is 2, 8, 6. Therefore, it belongs to group 6A.
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SiO2
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Non-metallic
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(a) Since the element A belongs to group II, it will have two valence electrons. On the other, the element B belongs to group 15 and so it will have 15 - 10 = 5 valence electrons.
(b) The electronic configuration of element A is 2 and so the valency is 2. On the other hand, the electronic configuration of the element B is 2, 8, 5 and so the valency is 3. -
(a) Element X.
(b) 2nd Period.
(c) Element Y.
(d) Element Z.
