Valance shell means ……………..
A) inner shell
B) middle shell
C) outermost shell
D) both A and B
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A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m s^-1, what is the recoil speed of the gun?
Given: m1 = 0.02 kg, m2 = 100 kg, v1 = 80 m s-1 To find: Recoil speed (v2) Formula: m1u1 + m2u2 = m1v1 + m2v2 Calculation: Initially gun and shell are at rest. ∴ m1u1 + m2u2 = 0 Final momentum =...
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If number of electrons in M-shell is half of K-shell then atomic number and name of element.
B) 11, Sodium
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l = 0 — i) d – sub shell , 1 = 1 — ii) s – sub shell , 7 = 2 — iii) f – sub shell
C) a → ii, b → iv, c → i, d → iii
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The four quantum numbers for valance electron of Sodium atom are ………………
C) n = 3, l = 0, mI = 0, ms = +1/2
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The valance electrons in the atom of an element is depicted in short form by …………….. symbol or …………….. dot structure
B) Lewis, electron
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The drawbacks of electron theory of valance is/are ……………..
Correct option is D) All of these
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An element A forms a chloride ACl4 . The number of electrons in the valance shell of A.
Correct option is D) 4
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Valance shell electron pair repulsion theory was proposed by ……………..
A) Sidgwick and Powell
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Valance bond theory was proposed by ………………..
B) Linus Pauling
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The molecule with two bond pairs in two covalent bonds around the nucleus of the central atom without any lone pair in the valance shell is
Correct option is A) BeCl2
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