What is the wavelength of a photon that will be emitted when an electron in the hydrogen atom moves from n
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Aluminum nitrate is an ionic compound, meaning that it is made up cations and anions. By convention when writing the formula for an ionic compounds the cation part shall be placed in front the anions. Thus the cation would contain aluminum and the anion shall be a polyatomic nitrate ion consisting of nitrogen and oxygen. The bracket with subscript 3 attached resembles the ratio between the two species, aluminum ions and nitrate ions. For each aluminum ion in the compound there shall be three corresponding nitrate ions.
Aluminum form ions of charge +3 whereas nitrate ions are of charge -1. Write the charge of the ion as the superscript in reverse (i.e., write as in
and
in
, omitting any 1.)
The period is equal to the number of shells present in an atom.
The group number is equal to the number of valence electrons.
<h3>What is the period in the periodic table?</h3>A period in the periodic table is a row of chemical elements.
The horizontal rows (which Mendeleev called series) are called periods and the vertical columns, are groups.
Elements having similar outer electronic configurations in their atoms are arranged in vertical columns.
The period indicates the value of n for the outermost or valence shell. The period is equal to the number of shells present in an atom. To find a period, the no. of shells =no. of periods.
Example: Na- 2,8,1 - Three shells are there, so period no. is 3.
Calcium - 2,8,8,2 - Four shells are there, so period no. is 4.
To determine the group, we need to understand some rules:
1. If the element is in s block, then the group number is equal to the number of valence electrons.
Example: Mg(12) - 2,8,2
Group = no. of valence electrons = 2
2. If the element is in the p block, then the number of the group can be determined by the formula: (number of valence electrons + 10).for groups.
Example: S(16) - 2,8,6
Group = no. of valence electrons+ 10 = 6+ 10 = 16
3. If the element is in the d block, then the number of the group can be determined by the formula: number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell).
Example: Fe(26):
Group = number of electrons in(n−1)d subshell + (number of electrons in (n)s subshell) = 6+2 = 8
4. If the element is in the f block, then the number of the group is always 3. Example: Cerium (58) belongs to the 3rd group.
Learn more about the period in the periodic table:
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