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The atomic number is the number of protons; 56. The mass number is the number of protons plus the number of neutrons, so 56+82=138.
The element is barium, by the way, because of the number of protons.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoIf the isotope is electrically neutral, as seems to be implied, the number of protons will be the same as the number of electrons. The number of protons is the same as the atomic number, therefore 56. The mass number of an isotope is the sum of its numbers of protons and neutrons, in this instance, presumably, 138. (Isotopes do not have "neurons!.)
Wiki User
∙ 11y agoThe number of protons equals the number of electrons in a neutral atom. The atomic number is the number of protons, which is 56 in this example. The mass number is the number of protons plus the number of neutrons, which is 138.
Wiki User
∙ 11y agoThe atomic number is the number of protons in an atom, which is the same as the number of electrons in a neutral atom. So the atomic number of this atom is 56. The mass number of an isotope is the sum of the atom's protons and neutrons, which for this atom is 56 + 82 = 138.
Wiki User
∙ 12y agoIf an atom has 26 and 30 neutrons its atomic number would be 26 and its mass number 56.
Its symbol would be 56Fe.
Wiki User
∙ 11y ago138
56Ba, barium-138
D:< >:U
Wiki User
∙ 11y agoBarium. It has 56 protons, and sometimes the sum of its protons and neutrons is 138.
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What is element 89 on the Periodic Table?
Actinium (Ac) Atomic Number: 89 Atomic Weight: 227 Protons: 89 Electrons: 89 Neutrons: 138 -----(227-89=138)
What is the number of protons neutrons in radium?
How many neutrons in actinium?
The number of neutrons is the difference between the atomic mass of an isotope and the atomic number. Actinium has a great number of isotopes, each with a different mass or number of neutrons.
What has 88 protons and 138 neutrons?
The number of protons of an atom is given by its atomic number. Checking the periodic table, we see that the atom with 88 protons is radium. The isotope of radium with 138 neutrons would thus be 226Ra.
How many neutrons are there in isotope Rn 220?
The atomic number is 86 which gives the number of protons. 220Rn has 220 protons and neutrons so the neutron count iscalcualted as follows: 220 -86 = 134 neutrons 220Rn is an unstable isotope of Radon.
What is the number of neutrons in the element radium?
How may neutrons are in actinium?
Each isotope has a different number of neutrons; Ac-227 has 138 neutrons.Number of neutrons = Mass number of an isotope - Atomic number of the element
How many protons and neutrons does radium have?
88
How many protons and electrons and neutrons does berkelium have?
Number of neutrons = Atomic mass of an isotope - atomic number of the element The atomic number of berkelium is 97.Number of neutrons = Atomic mass of an isotope - atomic number of the element The atomic number of berkelium is 97.
What is element 89 on the Periodic Table?
Actinium (Ac) Atomic Number: 89 Atomic Weight: 227 Protons: 89 Electrons: 89 Neutrons: 138 -----(227-89=138)
How do you calculate protons neutrons isotopes for radium?
Atomic number of uranium: 92 (the same for all the isotopes) Atomic number of an element = number of protons = number of electrons Atomic mass of the isotopes of uranium: 234, 235, 236, 238, 239, 240, ...., etc. Atomoc mass - Atomic number = Number of neutrons
What period is element 89 on the periodic table?
Actinium (Ac) Atomic Number: 89 Atomic Weight: 227 Protons: 89 Electrons: 89 Neutrons: 138 -----(227-89=138)
What is the atomic number and atomic mass number of barium?
The atomic number of barium is 56. It has naturally occurring isotopes with mass numbers of 130, 132, 134, 135, 136, 137, and 138.
How many neutrons does an atom of radium have?
The number of neutrons in the nucleus in any atom varies, however, the average is easy to find. The atomic number is the number of both protons and electrons. The atomic mass is the number of AMUs (atomic mass units) in the atom. 1 amu is the same as the mass of 1 proton or 1 neutron. the mass of the electrons is negligible. Because of this, subtract the atomic number from the atomic mass and you should have the average number of neutrons.
What is the number of protons neutrons in radium?
What is the biggest atomic number?
The atom discovered with the highest atom number = number of proton = number of electrons Note that some negative ions might be bigger. The biggest element so far discovered is 294Uuo (Ununoctium, element 118), a superheavy transactinide element. Only a small number of atoms of this element have ever been produced. The caesium atom with an empirical radius of 260 pm.
