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why is there an abrapt increase in melting point from Ga to In?

why is there an abrapt increase in melting point from Ga to In?

Grade:6

1 Answers

tumwizere brian
12 Points
5 years ago
from gallium to thallium there is addition of a full d-orbital. this orbital has got poor shieding effects as compared to other orbitals. since there is also increasing atomic number and atomic radius, the d-orbital will not shied well the outer s and p orbitals hence are strongly attractes by the nucleus. this inesence increases the metallic character from gallium to thallium hence, increased melting points. in that trend.
 

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