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elements exist in more than one form eg carbon 12 and carbon14

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Which statement best explains why most atomic masses on the periodric table are decimal numbers?

Most atomic masses on the periodic table are decimal numbers because they are weighted averages of the masses of all isotopes of an element, taking into account their relative abundance. Since isotopes have different masses, the atomic mass is typically not a whole number.


By adding the atomic masses?

You will get the atomic bomb!


The current standard for atomic masses is?

The current standard for atomic masses is based on the Carbon-12 isotope. It is defined as exactly 12 atomic mass units (amu), with all other atomic masses determined relative to it. This standard allows for consistency in measurements and comparisons of atomic masses across different elements.


How were the atomic number and the atomic masses of the elements determined?

Atomic masses are determined by mass spectrometry. The atomic number is identic with the number of protons in the atom - depends on position in the periodic table.


The average atomic mass of an element is the average of the atomic masses of its?

The average atomic mass of an element is the average of the atomic masses of its isotopes (that is a weighted average). You have to take into account the abundance of each isotope when they do your averaging.


What elements have such small masses that they are not even considered when atomic masses are calculated?

Electrons


What atoms with same atomic number but different atomic masses?

Isotopes are atoms with the same number of protons (same atomic number) but different numbers of neutrons, leading to different atomic masses. For example, carbon-12 and carbon-14 are isotopes of carbon with atomic number 6 but atomic masses of 12 and 14 respectively.


Which Russian scientist related chemical properties and atomic masses?

Dmitri mendeleev related the chemical properties and atomic masses around 1860


What did Dimitri Mendeleeve do?

Dmitri arranged the elements in order of increasing atomic masses. He arranged elements in rows and columns according to atomic masses.


What are the atomic mass of elements rarely whole numbers?

1. First cause: the atomic weight is the sum of the weights of protons, neutrons ans electrons.; they don't have masses as integers.2. Second cause: also occurs the so-called mass defect.Not atomic mass for elements; atomic weight is correct.


Why are all atomic numbers all whole numbers and most atomic mass number end with a decimals?

this is because the atomic number is the number of protons in an atom, and this never changes. However, the recorded atomic mass is a weighted average of all of the isotopes of the atom, because atomic mass is the number protons plus the number of neutrons, and the number of neutrons in an atom differs, causing different atomic masses.


State the name and the mass of the isotope relative to which all atomic masses are measured?

The isotope used as the reference for atomic masses is carbon-12, with a mass of 12 atomic mass units (amu).

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