Group Period Form Gratuito

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The period of an element corresponds to the principal quantum number of the Valence shell. The block of an element corresponds to the type of orbital which receive the last electron. For s-block elements, group number is equal to the number of valence electrons.
The period of an element corresponds to the principal quantum number of the Valence shell. The block of an element corresponds to the type of orbital which receive the last electron. For s-block elements, group number is equal to the number of valence electrons.
Valence Electron — Group 1. Valence Electrons — Group 2. To 8 valence electrons — Add 10 to the valence electrons to get the group number of the element.
Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
The group of an element is predicted from the number of electrons in the valence shell or/and penultimate shell as follows: a)For s block elements, group number is equal to the number of valence electrons. b) For p block elements, group number is equal to 10+number of electrons in the valence shell.
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
For s-block elements, group number is equal to the number of valence electrons. For p-block elements, group number is equal to 10+number of electrons in the Valence shell. For d-block elements group number is equal to the number of electrons in a (n-1) d subshell + the number of electrons in Valence shell.
The number of valence electrons in the atom determines the group number of that atom i.e. if an element has 4 valence electrons then it must belong to group IV A. Since sodium has 3 shells, it belongs to period 3. Also, we notice that this element has 1 electron in its outermost orbit therefore it belongs to group I Am.

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