
(a)
Interpretation:
The atoms of a main-group element in period
Concept introduction:
On moving from left to right in a periodic table, the effective nuclear charge increases. The effective nuclear charge pulls the valence electrons closer to the nucleus. Thus, the atom becomes smaller.
On moving from top to bottom in the group, the higher principal energy levels become farther from the nucleus. Therefore, the effective nuclear charge cannot pull the valence electrons closer to the nucleus. Thus, the atom size becomes larger.
(b)
Interpretation:
The atoms of a main-group element in period
Concept introduction:
On moving from left to right in a periodic table, the effective nuclear charge increases. The effective nuclear charge pulls the valence electrons closer to the nucleus. Thus, the atom becomes smaller.
On moving from top to bottom in the group, the higher principal energy levels become farther from the nucleus. Therefore, the effective nuclear charge cannot pull the valence electrons closer to the nucleus. Thus, the atom size becomes larger.

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Chapter 11 Solutions
EBK INTRODUCTORY CHEMISTRY: AN ACTIVE L
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- Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution. If neutral, simply write only NR. Be sure to include the proper phases for all species within the reaction. N₂H₅ClO₄arrow_forwardPlease help me with identifying these.arrow_forwardCan I please get help with this?arrow_forward
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