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The Atomic Mass shown on the periodic chart is the weighted average of the naturally occurring isotopes of that element.
It works like this: What is the average weight of 4 people where three weigh 120 and one weighs 90? (In this group, the most common weight is 120 so the average will be close to 120) The weighted average is:
75% x 120 + 25% x 90 = 90 + 22.5 = 112.5
All of the member's weights were whole numbers but the average is a fraction.
Each isotope, similarly, has a whole number weight but they occur at different percentages.
If you see a whole number weight on the periodic chart it is the weight of the longest-lived isotope since it has no naturally occurring stable isotopes...you will sometimes see this weight in parentheses.
What else can I help you with?
How are the empirical and molecule formulas for a compound related?
The empirical formula of a compound represents the simplest whole-number ratio of the elements present, while the molecular formula indicates the actual number of atoms of each element in a molecule of the compound. The molecular formula can be a multiple of the empirical formula, meaning that it may contain the same elements in a proportion that is a whole number multiple of the empirical ratio. For example, if the empirical formula is CH₂, the molecular formula could be C₂H₄, C₃H₆, etc., depending on the actual number of atoms in the molecule.
Why is the atomic mass of an element not a whole number while the atomic number is?
The atomic number refers to the number of protons in the atom. Since the proton cannot be an in-between number, the atomic number will have to be a whole number. On the other hand, the atomic mass does not have to be a whole number because it is the mass of an atom and is roughly equivalent to the number of protons plus the average number of neutrons in that particular element.
What is the atomic number of 6?
Carbon is a non meta element. Atomic number of it is 6.
The mass number of an element is equal to what of an element?
The sum of the number of protons and the number of nuetrons.
What is an element's atomic mass not listed as a whole number on the periodic table?
Few elements have isotopes. their atomic mass is not a whole number.
Is 1 the identity element or a whole number?
1 is a whole number. It is the identity element with respect to multiplication but not addition.
Can the empirical formula of a compound be triple its molecular formula?
No, the empirical formula represents the simplest whole-number ratio of atoms in a compound, while the molecular formula shows the actual number of each element present in a compound. Therefore, the empirical formula cannot be triple the molecular formula.
What could be a molecular formula for the empirical formula C2H2?
The molecular formula for the empirical formula C2H2 is also C2H2. The empirical formula gives the simplest whole number ratio of atoms present in a compound, whereas the molecular formula provides the actual number of atoms of each element in a molecule.
What element has the atomic number for 3.14?
No element has this atomic number. All atomic numbers are whole numbers.
How does the empirical formula differ form the molecular formula?
The empirical formula shows the simplest whole-number ratio of atoms in a compound, while the molecular formula gives the actual number of each type of atom present in a molecule. For example, glucose has an empirical formula of CH2O and a molecular formula of C6H12O6, showing the actual number of atoms in each molecule.
Does the mass number of an element have to be a whole number?
Approximately, yes. But the mass number is an average of the masses of the isotopes of the element, weighted together according to their abundance. This averaging of different whole numbers results in the mass number not being a whole number.
How are the empirical and molecule formulas for a compound related?
The empirical formula of a compound represents the simplest whole-number ratio of the elements present, while the molecular formula indicates the actual number of atoms of each element in a molecule of the compound. The molecular formula can be a multiple of the empirical formula, meaning that it may contain the same elements in a proportion that is a whole number multiple of the empirical ratio. For example, if the empirical formula is CH₂, the molecular formula could be C₂H₄, C₃H₆, etc., depending on the actual number of atoms in the molecule.
What is the atomic number of an element represented by the diagrams?
The atomic number of an element is the number of protons in its nucleus. It is represented by the whole number above the element's symbol in the periodic table.
Is C4H10 an empirical formula or a molecular formula for butane?
C4H10 is the molecular formula for butane, as it represents the actual number of atoms of each element in a single molecule of the compound. The empirical formula for butane would be CH5, as it shows the simplest whole number ratio of atoms present in the compound.
Is zero the identity element for whole number-multiplicaton?
No.
Why is the atomic mass of an element not a whole number while the atomic number is?
The atomic number refers to the number of protons in the atom. Since the proton cannot be an in-between number, the atomic number will have to be a whole number. On the other hand, the atomic mass does not have to be a whole number because it is the mass of an atom and is roughly equivalent to the number of protons plus the average number of neutrons in that particular element.
What do whole numbers on the periodic table represent?
The whole number, the one at the top, above the element's symbol in the element box, is the atomic number. The atomic number is the number of protons per atom in that particular element. The bottom number, that is always a decimal, is the atomic mass.
