Respuesta :
The elements changes from nonmetal to metal because the metallic character increases down the group 14 (4A)group due to low ionization energy.
The elements in a modern periodic table are arranged in increasing order of their atomic number. In the modern periodic table, the horizontal rows are known as periods and vertical columns are known as groups.
The elements of on moving down to group are as follows: Carbon, Silicon, Germanium, Tin, and Lead.
The general electronic configuration of group 14 (4A)is ns np. The size of elements increases on moving down the group. Therefore, Lead has the largest size, whereas carbon has the smallest size.
The energy that is needed for the removal of an electron of an atom from its gaseous state is known as ionization energy. Higher the ionization energy, more difficult is to remove an electron from an atom. Down the group in a periodic table, the number group 14 (4A)of shells increases and the distance between the electrons and nucleus increases and hence, nuclear charge decreases. Therefore, lead has less ionization energy, which means elements with low ionization energy will form cation faster. Thus, the metallic property down the group increases. Hence, on moving down the group the elements change from nonmetal to metal.
To learn more about group 14 (4A) refer the link:
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