How many electrons with l=2 are there in an atom having atomic number 54.
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Write the electronic configurations of two elements P (atomic number 17) and Q (atomic number 19) and determine
Electronic configuration of ‘P’ : 2,8,7 Group number: 17 Period number: 3 Electronic configuration of Q: 2,8,8,1 Group number: 1 Period number: 4
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There are 15 dozen candles in a box. If there are 39 such boxes. How many candles are there in all the boxes together?
(a) Total number of candles = 15 × 12 × 39 = 7020
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There are 12 dozen mangoes in a box. If there are 43 such boxes, how many mangoes are there in all the boxes together?
(c) Number of mangoes = 12 dozens = 12 × 12 = 144 Number of mangoes in 43 boxes = 43 × 144 = 6192
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There are some balls of red, green and yellow colour lying on a table. There are as many red balls as there are yellow balls.
(b) According to question R = y and y = 2G ∴ R = 2G Hence, the number of red balls is double the number of green balls.
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In an atom there are four orbits, the maximum number of electrons in this atom will be -
(B) The maximum number of electrons is 36.
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Write the electronic configuration of two elements P (atomic number 17) and Q (atomic number 19)
EGckonic Configuration of 'P'-2,8,7 Group number - 17 Period number 3rd Period Electronic Configuration of 'Q' - 2,8,8,1 Group number - 1 Period number - 4th Period
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An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason :
Position of P Group-2 Because it has 2 valence electrons/ 2, S, 8, 2 Period-4 Because it has 4 shells/2,8,8,2 Position of Q Croup-17 Because it has 7 valence electrons/ 2, 8, 7 Period-3 Because it has 3 shells/...
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Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table.
(i) Nitrogen: K shell-2 L shell-5 Phosphorus: K shell-2 L shell - 8 M shell-5 (ii) Phosphorus will be less electronegative because its elections are further...
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Out of the elements X and Y which has bigger atomic radius ? Give reason to justify your answer. (i) X has atomic number 18 and atomic mass 40.
Radius of Y is bigger than that of X. In 'X' the number of shells is three while in Y it is four.
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An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(i) The position of elements X in the modern periodic table is group number 17 and period number 3. The position of element Y in the modern periodic table is...
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