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Chapter 5 Notes
Chapter 5 Notes

... The s-block elements consist of the elements in groups 1 and 2 of the periodic table. Electrons from these elements fill the s orbital of each period. Group 1 (ALKALI METALS) fill the s orbital with 1 electron. These elements are considered to be reactive metals because they are not readily found in ...
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... Al and Tl are both metals in group 3 of the periodic table, but Al ions are only ever found in the +3 state. (Al3+ cations), but Tl is known to form compounds in which there can be Tl+ or Tl3+ cations. This tendency for elements at the bottom of groups 3, 4 and 5 to form compounds in which their out ...
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bg`d xng gmz moxa gmog dbcxd gmz tovd gmog
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... (E) of the additional neutrons required for nuclear stability. Answer B. Atomic radius decreases across a row and increases down a group. This is primarily due to the increase in effective nuclear charge and the shielding affect. ...
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Period 2 element



The period 2 elements are the chemical elements in the second row (or period) of the periodic table. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases; a new row is started when chemical behavior begins to repeat, creating columns of elements with similar properties.The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. This situation can be explained by modern theories of atomic structure. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the 2s and 2p orbitals. Period 2 elements obey the octet rule in that they need eight electrons to complete their valence shell. The maximum number of electrons that these elements can accommodate is ten, two in the 1s orbital, two in the 2s orbital and six in the 2p orbital. All of the elements in the period can form diatomic molecules except beryllium and neon.
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