Mass Number

Key Questions

• How can the mass number be calculated?

  Answer:

  Well, the mass number of an atom is simply the number of massive, nuclear particles, protons, and neutrons....

  Explanation:

  And so for #""^1H#, the mass number is simply 1; for #""^2H#, the mass number is simply 2; for #""^3H#, the mass number is simply 3. The isotopes contain #"0, 1, 2 NEUTRONS"# respectively.

  Most of the heavier atoms have a range of isotopes, and the quoted atomic mass on the Table is the weighted average of the isotopic masses..

  anor277 · 1 · May 23 2018
• What is mass number?

  Answer:

  The total amount of protons and neutrons

  Explanation:

  It's important to remember that mass number is not the same as atomic mass. In physics the mass number is indicated with an A, and varies for every atom in the periodic table, and even for the same atom if it has isotopes.

  Shulgin · 1 · Mar 22 2018

• How do you find mass number of an isotope?
• What does the difference between the mass number and the atomic number tell us?
• Why is mass number a decimal?
• What type of radioactive decay produces no change in mass number?
• How is the mass number written?
• What is the nucleon number?
• What is mass number equal to?
• What does the mass number tell us?
• How is mass number related to isotopes?
• How is the atomic mass number changed by gamma decay?
• How does mass number relate to the particles in the atom?
• How can the mass number be calculated?
• Does the mass number of an element ever change?
• What are common mistakes students make with mass numbers?
• What is mass number?
• Question #ce59d
• All the atoms of a particle element have an equal number of protons and neutrons (Z=N). Which one is true? A) The atomic weight must be a whole number. B) The mass number must be exactly twice the atomic number for each atom.
• Question #d4d86
• Question #2f9e6
• Question #32808
• What is the difference between atomic mass and mass number?
• What is the difference between mass number and atomic number?
• What is the mass number of potassium?
• What is the mass number of gallium-68?
• Does an atoms mass number or atomic number ever change?
• What is the mass number of zinc?
• A carbon isotope consists of 6 protons, 6 electrons and 8 neutrons, what is the mass number?
• An atom of a sodium has 11 proton, 11 electrons, and 12 neutrons, what is its mass number?
• An element has 5 protons, 6 neutrons, and 5 electrons. What is the mass number?
• How would you calculate the mass number of an atom?
• What element has a mass number of 65?
• Would you find the number of electrons when given atomic number, mass number, and number of protons and neutrons?
• What is the mass number of oxygen?
• What is the mass number and the atomic number of Boron-11?
• What is the mass number of an ion with 105 electrons, 158 neutrons, and a +1 charge?
• As an atom becomes an ion, what happens to its mass number?
• How many protons, neutrons, and electrons does a magnesium atom with a mass number of 25 contain?
• What element has a mass number of 55?
• The element calcium has the atomic number of 20 and the mass number of 40, how many neutrons does it have?
• What is the mass number of an ion with 104 electrons, 157 neutrons, and a +1 charge?
• What determines the mass number of an element?
• What is a rule for determining the mass number of an atom?
• An isotope of U-235 has 92 protons in its nucleus. How many neutrons are there in the nucleus of a U-238 isotope?
• How do we know what atomic number an element has???
• What is the mass number for Technetium when the atom has 56 neutrons?
• How many protons does a sodium atom have?
• Question #3ae92
• What is the mass number of a Calcium atom if it has 20 neutrons?
• How many neutrons are in an atom of chlorine?
• How is the mass number related to the number of protons and neutrons an atom has?
• Question #ef268
• What is the mass number of boron?
• Question #5ccda
• What is the mass, in grams, of a single iridium atom (#m_Ir = "192.22 u"#)?
• How many neutrons are present in the nucleus of a phosphorus atom?
• Why isn't mass number listed with each element on the periodic table?
• How many protons, neutrons, and electrons are in a silver atom, with a mass number of 108?
• Question #83972
• #"Isotopes A"# and #"B"# EACH have six protons. #A# has six neutrons, and #B# has eight neutrons. What are the charges of each isotope?
• How do you calculate the atomic mass number of an element?
• Question #3c657
• A positive two ion of calcium, #Ca^(2+)# would have how many protons, electrons and neutrons?
• An atom contains 70 protons, 70 electrons, and 99 neutrons. What is the mass number?
• An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?
• What are the numbers of protons, neutrons, and electrons in an isotope of titanium with a mass number of 50?
• How many protons are in an atom represented by #""_88^220Ra#?
• Which element has 16 neutrons, 15 protons, and 15 electrons?
• What is the formula mass of #Ca(OH)_2#?
• Are atomic mass, formula mass and molar mass the same thing?
• What is the formula mass for #C_6H_12O_6#?
• What is the formula mass for the following compound #C_6H_12O_6#?
• What is the formula mass for the following compound #Fe(NO_3)_3#?
• For #Al#, its atomic number is 13 and its mass number is 27. How many neutrons does it have?
• How many neutrons in #""^14CH_4#?
• Question #14558
• How many neutrons does #Fe# have?
• How many protons, neutrons, and electrons are in a neutral atom of sodium?
• How many neutrons are in #""^239 Pu#?
• The mass number of common krypton is 84, and its atomic number is 36. krypton-84 has how many neutrons within each isotope?
• The atomic mass of potassium is 39. If its atomic number is 19, how many neutrons are in each potassium atom?
• Zirconium has an atomic number of 40 and an atomic mass of 91. How many neutrons does it have?
• How many protons, electrons, and neutrons does a neutral atom of an element with atomic number 48 and mass number 120 contain?
• How many protons and neutrons are in an atom of Mo-94?
• What is the mass number of an atom of potassium that has 18 neutrons?
• If an atom contains 12 protons and 10 neutrons, what's its mass number?
• The mass number of a chromium atom is 52 and it has 24 protons. How many neutrons does this atom have?
• Question #0a5fe
• Question #a8865
• What species is represented by the following information? #p^+ = 14#, #n^o = 12#, #e^(-) = 10#
• What is 206 Pb mass number?
• What is the element with a mass number of 222?
• What element has a mass number of 40 and 20 protons?
• What element has a mass number of 40?
• What element has atomic number of 9?
• What element has mass number of 4?
• An atom of copper has a mass number of 63 and an atomic number of 29. How many protons does it have?
• An atom has 13 protons and 14 neutrons. What is its mass number?
• Question #e5346
• Which corner of the isotope symbol contains the mass number?
• How is the mass number of an isotope expressed in the name of an atom?
• If you had a balance that could determine the mass of a proton, how many electrons would need to weigh a on the same balance to measure the same mass as a single proton?
• Question #06bb1
• What is the mass number of an atom that has an atomic number of 8 and 9 neutrons?
• Question #e7b81
• How many neutrons in the iron nucleus?
• When the mass number of oxygen is 16, how many neutrons does oxygen have in its nucleus?
• What is the average of the mass numbers of the isotopes of an element called?
• Question #37196
• What are the protons, neutrons, and electrons for a sulfur(2-) anion with a mass number of 33?
• Question #8d740
• What is the nuclear charge of an element?
• Question #a5065
• A 12. 2 g sample of X reacts with a sample of Y to form 78.9 g of XY. What is the mass of Y that reacted?
• How would you place these in order of greatest mass at the bottom and least mass at the top?
• What is the mass number of an atom which contains 28 protons, 28 electrons and 34 neutrons?
• A certain atom has 26 protons, 26 electrons, and 30 neutrons. What is its mass number?
• What is the the theoretical mass of tin formed from 302 g of tinstone?
• Question #29f82
• What is the total mass of 1.5 moles of H(g)?
• For a given atom, what is the mass number?
• Question #700fe
• The ion #"X"^(3-)# has #8# neutrons and its electron configuration ends up with #2p^6#. Find its mass number. [I can't find it, can someone please explain it to me?]
• What does the sum of the protons and neutrons in an atom equal?
• Question #dae51
• Question #0139f
• Inflated ball mass? cold air vs worm air?
• Question #021e1
• Question #5d492
• What is the #"mass number"# of an atom?
• Question #8eb40
• What is the mass-to-charge ratio of electrons?
• How do we find the number of neutrons in a nuclide, given #Z#, and the isotopic mass?
• How many protons in the #P_4# molecule?
• Question #db655
• What is the mass of an atom that contains two positively charged nuclides, and two neutrally charged nuclides? What is the atom?
• How many electrons, protons, and neutrons in the #""^67Zn# isotope?
• How do find the number of electrons, protons, and neutrons given a specific element?
• Question #4b778
• Question #22638
• How does lithium metal react with dinitrogen? And what is the electronic distribution with respect to the ions in the resultant salt?
• A certain negative ion #"X"^(2-)# has #18# neutrons in its nucleus and #18# electrons in its extra-nuclear structure. What is the mass number of the most abundant isotope of #"X"# ?
• A nuclide has 20 electrons and a positive charge. There are 18 neutrons. What is the nuclide?
• How many neutrons in an #""^238U# atom?
• What mass of silver (Ag) contains the same number of atoms as 50.6 g of boron (B)?
• Why is the mass number an integer but the relative atomic mass is not?
• How to identify curium mass number?
• Question #4d66b
• What is the isotopic distribution of gallium metal?
• How many neutrons are in a nucleus that has 45 protons and a mass number of 160?
• Question #4e40c
• What is the formula weight of methane?
• Question #e231f
• Can u name the 11 atom structure? thanks