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It is calculated by the relative electronegativity. Let's take HCl as an example. Chlorine is the more electronegative element, which partially attracts the electron shared by hydrogen. Hydrogen has partially donated an electron. Therefore in HCl, hydrogen and chlorine have +1 and -1 oxidation numbers respectively.
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What do oxidation numbers tell us?
The oxidation number now tells you how many more or less electrons the atom has.
Can the oxidation number of an element in a compound be a fraction?
No. it can't be fractional. However you can get fractional answers uch as Fe in Fe3O4 where the average oxidation state is 2.666.... You need to know something about the structure that will tell you what oxidation numbers of the Fe in this case two Fe with +3 and one Fe with +2 in each formula unit.
How can tell if an element has been oxidized or reduced in a reaction?
Oxidation involve loss of electrons and reduction involve gain of electrons.
How can you tell an elements oxidation number by looking at the periodic table?
1. Elements on their own have an oxidation # equal to 0. (ex. in the chem equation Ca + 2AgCl --> CaCl2 +2Ag, Ca and 2Ag would have oxidation #s equal to 0.) 2. Ions in ionic compounds have an oxidation # equal to their charge. (ex. in the chem equation Ca + 2AgCl --> CaCl2 +2Ag, 2AgCl = Ag+1 and Cl-1, and CaCl2 = Ca+2 and Cl2-1.)
What atom has the mass number of 25?
Knowing the nuclear charge of an element is important as it will tell you what kind of reactions you can expect. The element with the nuclear charge of 25 is manganese.
What does the oxidation number of an element tell you?
The oxidation number tells you the "combining power" of that element. For example, if Cu has a 1+ oxidation number then it will combine with Cl in a 1:1 ratio, and result in CuCl. If Cu has an oxidation number of 2+, then it will combine with Cl in a 1:2 ratio, and result in CuCl2.
What does the ( ) or (-) oxidation number tell you about an ion?
Its electric charge polarity. If (+) it is missing electrons, if (-) it has extra electrons.
What does the atomic number tell you about the parts of the element?
The atomic number of an element tells you the number of protons and neutrons that element has. Since an atom has a neutral charge, the number of electrons must equal the number of protons, so you can also tell the number of electrons that element has.
What does an element's atomic number tell about that emelent?
The number of protons in each nucleus of an atom of the element. Also if this element is an atom and not an ion (has no charge) the Atomic number is equal to the number of electrons in its quantum shells
What does the roman numeral tell about an element?
Roman numerals are used to identify the oxidation state of transition metals with more than one possible oxidation state.
What does the atomic number of an element tell you about the element?
Atomic number = Number of protons
Element's atomic number tell about that element?
The atomic number tells you the number of protons in the nucleus of that element.
What do oxidation numbers tell us?
The oxidation number now tells you how many more or less electrons the atom has.
Can the oxidation number of an element in a compound be a fraction?
No. it can't be fractional. However you can get fractional answers uch as Fe in Fe3O4 where the average oxidation state is 2.666.... You need to know something about the structure that will tell you what oxidation numbers of the Fe in this case two Fe with +3 and one Fe with +2 in each formula unit.
What does the atomic number tell you about an element?
The number of protons in the nucleus of each atom of the element.
Does the number of neutrons tell what element it is?
no
What does the atomic number of an element tell?
Number of protons
