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The correct expression - after IUPAC rules - is atomic weight.
The atomic weight unit is necessary to appreciate the atomic weights of chemical elements.
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What was the atomic mass unit system devised to make?
all of the above. platoweb
Is atomic number the number of protons and neutrons?
No, the atomic number is the same number of protons and electrons. To find the neutrons, you subtract the atomic weight by the atomic number. Make sure to round the atomic weight as well.
what a metal alloyed with iron to make tough steels?
Manganese - Mn Atomic Weight - 54.9380 Atomic # - 25
How many particles make up a barium?
its atomic number is 56 its atomic weight is 137 hope that helps
Which two subatomic particles make up the atomic weight of an atom of an element?
The protons and the neutrons make up the atomic weight of an atom of an element, they have roughly the same mass and electrons have so little mass that they're negligible.
What two parts of the atom make up the atomic weight of the atom?
The protons and the neutrons.
What elements do helium make up?
The only element helium makes up is helium. Atomic number: 2 Atomic weight 4.00260 u (avg)
What is the name of the element with lowest atomic weight?
Hydrogen. It has one proton and one neutron--you can't make an atom lighter than that.
What happens to the atomic number and mass number of a nucleus when it captures an electron?
Since the actual weight of an atom is extremely small, a more convenient way of designating the relative mass of the various atoms is the atomic weight. The atomic weight of an atom was originally defined as the sum of the number of its protons and its neutrons. Unfortunately, this idea proved not valid as exact measurements of the actual weights of the various elements and sub-atomic particles were made. The new definition of an atomic mass unit is that it is 1/12 of the atomic weight of Carbon-12. Most listing of elements include isotopes to display an average atomic weight.
Which particles account for the difference between the atomic number and the mass number?
The answer is that it is neutrons that account for the difference between atomic weight and atomic number. The atomic number is the number of protons or the number of electrons in the atom, since they are normally equal. The atomic weightis the sum of the total number of protons, electrons AND neutrons in the atom. Knowing both the atomic number and the atomic weight of an atom lets you know the number of neutrons in the atom (the isotope). Example: Uranium, Atomic Number 92, Atomic Weight 235. The atomic number tell you that the uranium atom has 92 protons and 92 electrons. The atomic weight tells you that it has a combined total of 235 protons, electrons and neutrons. Since you know from the atomic number that there is a total of 184 protons and electrons in the atom (92 + 92) and from the atomic weight that the total number of protons, electons and neutrons is 235 (92 + 92 + X = 235), you now know that there are 151 neutrons in that uranium atom. The atomic number and atomic weight together tell you that the uranium atom 235 has 92 protons, 92 electons and 151 neutrons.
Is the atomic weight of chlorine 35.5 because of electrons?
No, electrons only make a negligible contribution to atomic weight. On the periodic table the atomic weight listed for most of the elements is the average of that element's isotopes. Chlorine has 2 common isotopes: Chlorine-35 (75.77% of all chlorine) and chlorine-37 (24.23%) This works out to an average mass of about 35.5.
What two words make up the name of a species in linnaeus naming system?
The two word system that was devised for naming organisms is called "binomial nomenclature." "Binomial" is defined as "two names." ~ Kimberlee
