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What is the atomic mass of dysprosium?
The atomic mass of dysprosium is 162.5, though that may just be approximate
What isotope of carbon has been chosen as the reference isotope for atomic mass units?
The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless). Relative isotopic mass is the relative mass of a given isotope scaled with carbon-12 as exactly 12.
What element has an atomic mass of 4.0?
The element with an atomic mass of 4.0 is helium. Helium has an atomic number of 2, which means it has two protons in its nucleus. It also has two neutrons, giving it an atomic mass of 4.0.
What is the atomic weight for copper?
Copper can be found on the Periodic Table of Elements. Copper's symbol is Cu, and the atomic number is 29. The atomic mass is hard to find searching the Internet, but here it is. The atomic mass for Copper is 63.546, also recognized as just 63.Atomic Number: 29Atomic mass: 63.546, or just 63**Note: The atomic mass for Copper and some other chemicals cannot be found on WebElements.
How atomic number better than atomic mass?
No two elements may have the same atomic number. But two elements may have same atomic mass. Hence atomic number is better than atomic mass.
What is the atomic mass of ununseptium?
117. For chemicals that are unnamed, use the prefic after the to "un-"s to figure out the last digit. sept-=7. The two "un-"s both indicate one. So, one one seven, or 117 actually, 117 is the atomic number, the mass is approx 292
How may neutrons does neon have?
Number of neutrons = Atomic mass - Atomic number Atomic number of neon: 10 Atomic mass: depending on the neon isotope, each isotope has a different mass
What is the difference between relative isotopic mass and relative atomic mass?
Atomic Mass is the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.Relative atomic mass is the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12.Relative isotopic mass is the mass of an atom of an isotope of an element compared with one-twelfth the mass of an atom of carbon-12.Thus an element will have ONE Relative Atomic Mass but there may be MANY individual Relative Isotopic Masses for an Element (depending on how many Isotopes it has).
Why atomic mass is always a whole number but atomic weight may be a decimal number?
Atomic mass is the total mass of protons and neutrons in an atom, which are whole numbers. Atomic weight, on the other hand, takes into account the abundance of different isotopes of an element, which can result in a weighted average that may be a decimal number.
What metal has the mass of about 56?
2.9 what? You haven't provided any units... units are g/cm cubed
What deos the atomic mass represent?
The atomic number is the number of protons in the nucleus of an atom.(Note: that in a neutral atom the number of protons in the nucleus is also equal to the number of electrons the atom has)The atomic mass is the mass (weight) of all the components of the atom but is dominated by the nucleus composed of protons and neutrons. Basically atomic mass is how many times an atom of an element is heavier than an atom of hydrogen, (whose atomic mass is taken as unity [1]).(Note: atoms with the same atomic number [ie an element] may have slightly differing atomic masses. This is because atoms can have differing numbers of neutrons in their nucleus. These variations in atomic mass are called "isotopes" of that element)I have made a related link below showing you a Periodic Table of the Elements. The numbers on the table are the atomic numberof the element.An element's atomic number represents the number of protons that are present in the nucleus of an atom in that element.The atomic number represents the number of protons there is in that element. It also represents the number of electrons for that particular element only if the atom is atomically neutral and is not electrically charged. Typically, an atom does not lose protons so it is reliable to base this number on the number of protons in an atom as opposed to the number of electrons, seeing that electrons can be easily lost.
Why is lithium's mass number a decimal number?
The mass number is a whole number, but the atomic mass may not be. Mass numbers are the total number of neutrons and protons in an isotope (different from atomic numbers, which are the whole numbers of protons only). These are also whole numbers, and for most lithium, it is 7. The mass number is 6 for lithium-6, which has only 3 neutrons. However, the "atomic mass" of an element is measured in atomic mass units, which are 1/12 of the weight of a carbon-12 atom (6 protons and 6 neutrons). Since neutrons are slightly heavier than protons, and there are more neutrons than protons in lithium-7 (3 protons to 4 neutrons), the atomic mass is slightly more than 7.
