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The mass number is the total amount of protons and neutrons in an atom (the number of protons is the same as the number of electrons) The atomic number is the number of protons (or electrons) in an atom. To find out the number of neutrons in an atom, you need to take the atomic number from the mass number An atom is normally written like this: Mass number Ca Atomic number The Mass number can be written as (A) and the atomic number can be writtens as (Z)
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoIsotopes of the elements are quoted with two numbers. The one which determines the name of the element is the atomic number which is the number of protons in the nucleus. The total of protons plus neutrons is the other number, which can vary for any one element's isotopes, this used to be called the atomic weight but now it seems to be Atomic Mass number.
Thus uranium has 92 protons, but the two main isotopes are 235 and 238, so they have 143 and 146 neutrons respectively
Wiki User
∙ 14y agoThe atomic weight (IUPAC recommend the use of the word weight in the case of elements) of an element is a multiple of the atomic mass unit.
The atomic mass unit is 1/12 from the atomic mass of the isotope carbon 12 in ground state.
Example: atomic weight of hydrogen is 1,00794 u.
Wiki User
∙ 13y agoThe mass of an electron is counted when the atomic mass is added up, but the mass of an electron is so insignificant it is taken into account like a zero.
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What is a synonym for atomic mass?
Unified atomic mass unit
How many atoms are in 1 atomic mass unit of hydrogen?
Atomic mass unit is a unit of mass for all chemical elements, not only for hydrogen. The atomic weight of hydrogen is [1,00784; 1,00811]; the conventional atomic weight is 1,008. 1 atom is equal to 1 amu.
What unit of measure is used to measure atomic weight?
expressed in unified atomic mass unit, amuHowever, for practical purposes in the laboratory the relative atomic mass is used so the unit would be gram. (Relative atomic mass compares the mass of all elements to that of the carbon-12 isotope taken as exactly 12)
What is atomic mass and the number of calcium?
Calcium has atomic number of 20, an atomic weight of 40.078 and an mass numbers of 40 - 48 inclusive in its isotopes. Atomic number is the count of protons in the nucleus. Mass number is the count of protons plus neutrons. The question refers to atomic mass rather than atomic weight. Atomic mass normally refers to the mass of a specific isotope of an element and is related to the mass number. Atomic weight ( or relative atomic mass as it is termed by IUPAC) the average mass of naturally occurring isotopes of an element. The relationship between mass number and atomic mass is defined in terms of the Atomic mass unit which is in simple terms 1/12 of the mass of a 12C atom. If you need to find out more about the relationship between mass number and and atomic mass you need to read the article "atomic mass unit" in wikipedia.
What is the dimension of atomic weight?
Atomic weight is a unit of measure whose unity value is that of the mass of a Hydrogen atom "1".
An atomic weight unit is the mass of one?
The atomic weight unit is 1/12 from the atomic mass of isotope 12C.
What is a synonym for atomic mass?
Unified atomic mass unit
How are the atomic mass unit and the atomic mass related?
because they are the sameAdded:Atomic mass is the quantitive propertie of the mass of an atom,the atomic mass unit is the (standard) UNIT by which it is measured:1 a.m.u. = 1.66*10-27 kg
How many atoms are in 1 atomic mass unit of hydrogen?
Atomic mass unit is a unit of mass for all chemical elements, not only for hydrogen. The atomic weight of hydrogen is [1,00784; 1,00811]; the conventional atomic weight is 1,008. 1 atom is equal to 1 amu.
What unit of measure is used to measure atomic weight?
expressed in unified atomic mass unit, amuHowever, for practical purposes in the laboratory the relative atomic mass is used so the unit would be gram. (Relative atomic mass compares the mass of all elements to that of the carbon-12 isotope taken as exactly 12)
What is meant by expressing atomic weight in grams?
It means that atomic weight is expressed in form of Molar weight. When we write that the atomic mass of an element is X, it means that it is X amu(atomic mass unit) and not X grams. An atomic mass unit is very less as compared to a gram. The molar mass of an element or compound is its same mass as in amu but in grams.
What is atomic mass and the number of calcium?
Calcium has atomic number of 20, an atomic weight of 40.078 and an mass numbers of 40 - 48 inclusive in its isotopes. Atomic number is the count of protons in the nucleus. Mass number is the count of protons plus neutrons. The question refers to atomic mass rather than atomic weight. Atomic mass normally refers to the mass of a specific isotope of an element and is related to the mass number. Atomic weight ( or relative atomic mass as it is termed by IUPAC) the average mass of naturally occurring isotopes of an element. The relationship between mass number and atomic mass is defined in terms of the Atomic mass unit which is in simple terms 1/12 of the mass of a 12C atom. If you need to find out more about the relationship between mass number and and atomic mass you need to read the article "atomic mass unit" in wikipedia.
Is atomic mass unit a SI unit of an atomic mass?
The atomic mass unit is not a SI unit. An atomic mass unit is equal to 1/12 from the atomic mass of the isotope 12C.
What is the dimension of atomic weight?
Atomic weight is a unit of measure whose unity value is that of the mass of a Hydrogen atom "1".
What is the unit of measurement use for atomic particles?
Atomic mass unit
Atomic Weight Of Sodium Chloride?
The mass (not atomic weight) of the formula unit of NaCl is 58,44 g (without other decimals).
What is the difference between atomic mass and atomic mass unit?
The atomic mass unit is used to express the measure of the atomic mass.
