Elements and Compounds

Why are atomic numbers not whole numbers?

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Answered 2012-01-24 00:57:30

The atomic numbers of an element is the average mass of all that element's isotopes. Some elements have A LOT of isotopes. Sometimes, that average isn't always a whole number.

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Related Questions

Why are atomic numbers never whole numbers?

Atomic numbers are always whole numbers!

Why are the atomic numbers on the periodic table not whole numbers?

The atomic number is always whole, atomic weight is not

Why are atomic numbers and atomic mass numbers always whole numbers?

The atomic nass is not always a whole number, but the atomic number is because its the number of protons and neutrons.

What element has the atomic number for 3.14?

No element has this atomic number. All atomic numbers are whole numbers.

Why is the relative atomic mass of chloride not a whole number?

Because relitive atomic masses are NEVER whole numbers.

Why are all atomic numbers whole numbers?

The atomic number is the number of protons.

How are isotopes related to atomic masses not being whole numbers?

isotopes are elements of the atomic number but have different mass numbers.

Are atomic mass numbers whole?

Possibly yes, most are in decimal form but are rounded to the nearest whole number- then displayed on the periodic table. So the atomic numbers don't have to be whole Hope I helped

Why are the elements 94 through 110 in the periodic table whole numbers?

1. All the atomic numbers are whole numbers. 2. If you think to atomic weight of heavy radioactive elements (atomic numbers from 93 to 118) is a rule of IUPAC to indicate in square parenthesis, [], the atomic mass of the most stable or known isotope.

Is a atomic number a whole number?

Yes, atomic numbers will always be a whole number. The atomic number references the number of protons in the atom. Since there cannot be a in-between number of protons, the atomic number will have to be a whole number.

Why the atomic mass numbers listed for elements on the Periodic Table are not whole numbers.?

Why are atomic masses of elements not generally whole numbers? The atomic masses listed on the periodic table are a weighted AVERAGE of an element'sisotopes. ... An element's atomic number is the number of protons in its nucleus. Number of protons specifies atom type.

Why don27t elements in the periodic table have whole numbers for their atomic masses?

Because the masses of protons, neutrons and electrons are not whole numbers.

Why are atomic numbers listed as whole numbers?

The atomic number is derived from how many protons are present in the nucleus of an atom. Becaue you cannot have a fraction of a proton present in an atom, atomic numbers must be non negative integers.

Why are atomic numbers always whole numbers?

An atom can't contain only part of a proton, so the number must always be a whole number

Why aren't atomic masses of elements not whole numbers?

because of its no. in table of elements

Why is the atomic number on the periodic tabe never a whole number?

The question is based on a complete lack of understanding as to what the atomic number is! They are always, without exception, whole numbers.

Why aren't the atomic masses of most element whole numbers?

Because their atomic masses are so precise and small that they can't be.

Why are atomic masses of elements usually not whole numbers?

Atomic masses of elements are usually not whole numbers because of isotopes. Elements tend to exist as more than one isotope, so the atomic mass in the corner is a weighted average of all of the isotopes an element exists as.

What is the mass of mercury Hg?

The atomic mass is 201 (rounded to whole numbers). Is that what you needed?

Why the mass numbers on the periodic table of elements are rarely whole numbers?

Elements also possess isotopes. So their average atomic mass is rarely whole number.

Why aren't atomic masses of most elements whole numbers?

because the mass of an electron is extremely small, making the atomic mass a whole number would be saying that the electron has no mass

Why is the atomic mass of nobelium a whole number?

For elements with no stable isotopes (like Nobelium), the mass number of the isotope with the longest half-life is used. Mass numbers are whole numbers.

What do the whole numbers on the periodic table respresent?

The Atomic number which is the number of protons in an atom's nucleus.

Why is the mass on the periodic table a whole number?

Atomic mass is not represented as whole numbers on the periodic table (unless it is rounded? But that's probably and highly unlikely). You are probably thinking of the atomic number. That is a whole number because there is a whole number of protons. (You can't have half a proton.)

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