Isotones of an element have -
(A) same number of electrons
(B) same number of protons
(C) same number of neutrons
(D) same number of neutrons & protons
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An element with mass number 81 contains 31.7% more neutrons as compare to protons find out atomic symbol of element.
Let protons = x Mass number = P+n Then neutrons= x + 31.7% of x 81= x + 1.317x X=35 Symbol= Br
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Write the electronic configuration of the element in which the element holds orbitals having the same energies
Kr (Z=36)e.c is 1s2 ,2s2 ,2p6 ,3s2 ,3p6 ,4s2 ,3d10,4p6 . 2p6 orbital has same energy as3s2 , &3d10 orbital has same energy as 4p6 etc.
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Assertion (A): Oxidation involves loss of electrons. Reason(R) :During oxidation number of an element decreases.
(b)Both A and R are true and R is not the correct explanation of the A.
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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 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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Two atoms of the same element are found to have different number of neutrons in their nuclei. These two atoms are -
(B) isotopes
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A cone and a cylinder have the same base area. They also have the same curved surface area.
(C) The slant height of the cone (in m) is 6.
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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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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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He^32 and He^31 nuclei have the same mass number. Do they have the same binding energy?
No, the binding energy of H31 is greater.
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