Respuesta :
Answer:
Explanation:
The changes in properties from metals to non-metals on a periodic table can be measured and determined by the metallicity or electropositivity of elements.
Metallicity is a measure of the tendency of atoms of an element to lose electrons.
a.
Down a periodic group, metallicity increases.
b.
Across a period from left to right electropositivity or metallicity decreases.
Metals are found in the left part of periodic table and the most reactive metal sits in the lower left corner. Non-metals are towards the right side of the table.
The periodic table is the arrangement of elements in rows and columns based on the increasing atomic numbers. The metallic character decreases from left to right and increases from top to bottom.
What are metals and non-metals?
The elements with the tendency to gain or lose electrons are divided as metals and nonmetals.
The metals have the tendency to lose electrons, while the nonmetals have the tendency to gain electrons. The degree of energy required for losing or gaining electrons is attributed to the electronegativity and the ionization energy of the elements.
- The metals on the left side of the periodic table had 1,2 valence electrons, while on the right side had 6,7 valence electrons. Thus, the tendency to lose electrons decreases across the period. Hence, the metallic character decreases, and the nonmetallic character increases.
- On going down the group, the number of shells increases with the ease of losing electrons, and thus the metallic character increases down the group.
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