For each of the following pairs, which element will have the greater metallic character:
(a) Li or Be; (b) Li or Na; (c) Sn or P; (d) B or Al?
This is called "flooding the board." =(
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Use the electronegativities. The more metallic character will be due to the more electropositive element.
To determine which element in each pair has the greater metallic character, we need to understand what metallic character is and how it changes across the periodic table.
Metallic character refers to the degree to which an element exhibits metallic properties such as metallic luster, high electrical and thermal conductivity, malleability, and ductility. It is influenced by factors such as atomic size, ionization energy, and electron affinity.
(a) Li or Be:
To compare the metallic character of Li and Be, we examine their positions in the periodic table. Li is located to the left of Be. As we move from left to right across a period in the periodic table, metallic character generally decreases due to increasing effective nuclear charge. Therefore, Be has less metallic character than Li. Li has a greater metallic character than Be.
(b) Li or Na:
In this case, we are comparing Li and Na. Na is located to the right of Li in the periodic table. As we move down a group in the periodic table, metallic character tends to increase due to the increasing atomic size and shielding effect. Therefore, Na has more metallic character compared to Li. Na has a greater metallic character than Li.
(c) Sn or P:
To compare the metallic character of Sn and P, we need to consider their positions in the periodic table. Sn is located to the left of P. As we move from left to right across a period, metallic character generally decreases. Therefore, Sn has more metallic character compared to P. Sn has a greater metallic character than P.
(d) B or Al:
Looking at the positions of B and Al in the periodic table, B is located to the left of Al. As we move from left to right across a period, metallic character generally decreases. Therefore, Al has more metallic character compared to B. Al has a greater metallic character than B.
In summary:
(a) Li has a greater metallic character than Be.
(b) Na has a greater metallic character than Li.
(c) Sn has a greater metallic character than P.
(d) Al has a greater metallic character than B.