Q. 37
Identify and name the metals out of the following elements whose electronic configurations are given below.
(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1
Answer :
Elements with 1 to 3 valence electrons are usually metals. Elements with 4 or more valence electrons are usually non-metals or metalloids.
(a) 2, 8, 2 – Magnesium (12)
(b) 2, 8, 1 – Sodium (11)
(d) 2, 1 – Lithium (3)
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PREVIOUSArrange the following elements in increasing order of their atomic radii.(a) Li, Be, F, N(b) Cl, At, Br, INEXTWrite the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17). Draw its electronic dot structure. What is the nature of the bond formed?
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