Write the electronic configurations of two elements P (atomic number 17) and Q (atomic number 19) and determine their group numbers and period numbers in the Modern Periodic Table.
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If S and T are two sets such that S has 21 elements, T has 32 elements, and S ∩ T has 11 elements, how many elements does S ∪ T have?
It is given that: n(S) = 21, n(T) = 32, n(S ∩ T) = 11 We know that: n (S ∪ T) = n (S) + n (T) – n (S...
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If X and Y are two sets such that X has 40 elements, X ∪Y has 60 elements and X ∩Y has 10 elements, how many elements does Y have?
It is given that: n(X) = 40, n(X ∪ Y) = 60, n(X ∩ Y) = 10 We know that: n(X ∪ Y) = n(X) + n(Y) – n(X ∩ Y) ∴ 60 = 40...
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What are the atomic numbers of the elements whose outermost electronic configurations are represented by (a) 3s^1 (b) 2p^3 (c) 3d^6?
(a) Na (Z = 11) has outermost electronic Configuration = 3s1 (b) N (Z = 7) has outermost electronic Configuration = 2p3 (c) Fe (Z = 26) has outermost electronic Configuration =...
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(a) What do you mean by valence electrons? (b) Write the electronic configurations of element K(19) ad N(7).
(a) The number of electrons present in the outermost shell of an atom is known as valence electrons. For e.g., the electronic configuration of Na (11) is ...
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To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements?
The elements in the first-half of the transition series exhibit many oxidation states with Mn exhibiting maximum number of oxidation states (+2 to +7). The stability of +2 oxidation state increases...
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Identify and name the metals out of the following elements whose electronic configurations are given below.
(a), (b) and (d) are metals. (a) Magnesium (b) Sodium (d) Lithium
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Name any two elements of group one and write their electronic configurations
Two elements of group 1 are Sodium (Na) and potassium (K). Their electronic configurations: Na = 2,8,1; K : 2,8,8,1 Similarity: Both have one valence electron. Formula of their oxides: Na2O; K2O.
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If S and T are two sets such that S has 21 elements, T has 32 elements, and S ∩ T has 11 elements, how many elements does S ∪ T have
It is given that: n(S) = 21, n(T) = 32, n(S ∩ T) = 11 We know that: n (S ∪ T) = n (S) + n (T) – n (S...
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If X and Y are two sets such that X has 40 elements, X ∪Y has 60 elements and X ∩Y has 10 elements, how many elements does Y have
It is given that: n(X) = 40, n(X ∪ Y) = 60, n(X ∩ Y) = 10 We know that: n(X ∪ Y) = n(X) + n(Y) – n(X ∩ Y) ∴ 60 = 40...
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Write the electronic configurations of the elements with the atomic numbers 61, 91 and 101.
The electronic configurations are given in the following table. Element Symbol ...
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