1.- Which of these atoms has the smallest radius? a) Si b) S c)Se d) I e) Na 2.-

Question

1.- Which of these atoms has the smallest radius? a) Si   b) S    c)Se    d) I    e) Na 2.- Which of the following choices is the general electronconfiguration for the valence electrons of elements in group2A? a) ns1    b)ns2    c)ns2np4   d)ns2np    e)ns2np6(n-1)d6 3.- A radio station broadcasts music at 94.1 MHz. Find thewavelength of these waves. 1.- Which of these atoms has the smallest radius? a) Si   b) S    c)Se    d) I    e) Na 2.- Which of the following choices is the general electronconfiguration for the valence electrons of elements in group2A? a) ns1    b)ns2    c)ns2np4   d)ns2np    e)ns2np6(n-1)d6 3.- A radio station broadcasts music at 94.1 MHz. Find thewavelength of these waves.

Explanation / Answer

1) S has the smallest radius because it is in the earliest row (I andSe are in one row later, so have an additional electron shell) Na, Si, and S are in the second row, but S has the greatest nuclearcharge, and is able to draw electrons closer to its nucleus better;atomic radii decrease across a row. The reason is that theadditional electron does not have as large of effect as theadditional proton; it is barely shielded b) 2A has 2 additonal electrons beyond the noble gas 3)   c = freq*wavelength   freq = 94.1 x106 s-1 wavelength = c/freq = (3x 108 m/s) /(94.1 x106 s-1) = 3.19 m

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