An element with mass number 81 contains 31.7% more neutrons as compare to protons find out atomic symbol of element.
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Compare the radii of two species X and Y. Give reasons for your answer. (a) X has 12 protons and 12 electrons (b) Y has 12 protons and 10 electrons
Radii of Y is less than X because Y is cation of X.
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An element ‘X’ has mass number 35 and the number of neutrons, is 18. Identify the group number and period of ‘X’.
Atomic number of X = Mass number of X – Number of neutrons = 35–18=17 Electronic configuration = 2, 8, 7 Group number = Valence electrons +10 = 17 Period =...
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An element “X” has mass number 35 and the number of neutrons, is 18. Identify the group number and period of “X”?
Atomic number of X = Mass number of X – No. of neutrons =35 18=17 Electronic configuration = 2, 8, 7 Group number = 17 , Period No. = 3
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The mass number of an element is 63. It contains 29 electrons. What is the number of protons and neutrons
In a neutral atom, number of electrons are equal to the number of proton. No. of protons = No. of electrons = 29 Mass number = No. of protons + No. of...
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Calculate the number of electrons, protons and neutrons in the following species.
(i) Phosphorus atom Number of electrons = Atomic number = 15 Number of protons = Atomic number = 15 Number of neutrons = Mass number - Atomic number = 31 - 15 =...
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Calculate the atomic number of an element whose mass number is 31 and number of neutrons is 13. What is the symbol of the element?
We know that, mass number = Number of protons + Number of neutrons But number of protons is equal to the atomic number. ∴ Mass number = Atomic number + number of...
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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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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' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'.
Atomic number of X = Mass number of X - No of neutrons =35-18=17 Therefore, Electronic configuration of X=2,8,7 Croup number =17 Period = 3 Valency=8-7=1
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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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