Element Valence of Valence Shell Electrons IE MJmol) 1.31 0.52 0.40 1.68 1.25 Rb

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Element Valence of Valence Shell Electrons IE MJmol) 1.31 0.52 0.40 1.68 1.25 Rb In the Bohr model, the circles around the nucleus are called shells and are mumbered sequentially n-1-2,m-3, etc.J In Table 2, the terw "Valence Shell'" indicates the shell that holds the valence electrons 13) Locate the elements H, Li, and Na on the periodic table. a) What is the relationship between Zur of these atoms, the number of valence electrons, and their locations on the periodic table? b) What is the relationship between the valence shell of each element in Table 2 and its location in the periodic table? c) Based on the location of Rb on the periodic table, complete the missing information in Table 2. 14) How does Zar of a neutral atom change as you move from left to right (across a row) on the periodic table? 15) How does IE of a neutral atom change as you move from left to right (across a row) on the periodie table? Part 3: Atomic Size RAme We have seen that the charge an electron "sees" from the DAMAN KU MORA nucleus is responsible for how tightly that electron is bound to the atom. This is why ionization energy increases across a row in the periodic table-Zr increases, so the outer electrons are B bound more tightly. We can utilize this concept to predictC atomic sizes as well. The Atomic Radius is defined as the distance from the center of the nucleus to the outermost electron in an atom. Some atomic radii are show in Table 3: ono Radius alence Atomic 89 +6 +6 +5 104 121 As Se 16) In Table 3, what is the relationship between the valence shell of each atom and its periodic table position? 17) Why does Zet increase as you move across a row on the periodic table (i.c. from B to C to O)? Recitation: Periodic Trendsl ASU | College of Integrative Sciences and Arts

Explanation / Answer

Answer for 15th ques:

The first ionisation energy increases from moving from left to right in a period. The reason being the fact that on moving across the period, the number of protons in the nuclei of each element increases. As a result, there is an increase in the nuclear charge. Consequently, the electrons in the valence shell will be more tightly held and will be difficult to remove.

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