Q. 77
The electric configurations of four particles A, B, C and D are given below
A 2, 8, 8
B 2, 8, 2
C 2, 6
D 2, 8
Which electronic configuration represents:
(i) magnesium atom?
(ii) oxygen atom?
(iii) sodium ion?
(iv) chloride ion?
Answer :
(i) magnesium atom has atomic number 12 so the answer is B.
(ii) C will be the desired answer as atomic number of oxygen atom is 8.
(iii) D represents the sodium ion, as it has E.C of 2,8.
(iv) A represents chloride ion because it has E.C of 2, 8, 8.
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PREVIOUSThe electronic configurations of three elements A, B and C are as follows:
A 2, 8, 1
B 2, 8, 7
C 2, 4
(a) Which of these elements is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?NEXTThe atomic number of an element X is 12.
(a) What must an atom of X do to attain the nearest inert gas electron configuration?
(b) Which inert gas is nearest to X?
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