74.
Tungsten has the atomic number 74. This number always indicates the number of protons in the atom. The number of neutrons can change (isotopes), as can the number of electrons (ions), without changing the identity of the element, but with more or less protons it will no longer be tungsten.
The atomic number of nitrogen is 7. So there are 7 protons and 7 electrons. The number of neutrons depends on the isotope. N-14 has 7 neutrons. N-15 has 8 neutrons. Number of neutrons = Mass number - Atomic number.
The number after the "N", 15, is the mass number. The mass number is the sum of the number of protons and the number of neutrons. So, if you find a periodic table, you can find the atomic number, which is the same as the number of protons. Because the atomic number of nitrogen is 7, it has 7 protons. Then we take the mass number (protons + neutrons) and subtract the number of protons to find the number of neutrons. 15 - 7 = 8 neutrons in 15N.
p,n =31,38 P=31 (from Periodic Table) N= 68.926-31=37.926
The mass number (A) is the sum of protons (Z) and neutrons (N) in an atom. It is represented as A = Z + N. The atomic number (Z) represents the number of protons in the nucleus of an atom, which determines the element's identity, while the neutron number (N) represents the number of neutrons in the nucleus.
equal to number of protons
The ratio of neutrons to protons in an atom can be calculated by subtracting the atomic number (number of protons) from the atomic mass (sum of protons and neutrons) of the atom. Mathematically, ratio of neutrons to protons = (Atomic mass - Atomic number).
The mass number of an isotope is the number of neutrons and protons in the isotope, let this be p +n = (mass number). To find the number of neutrons you need the atomic number (number of protons), let this be p. You then subtract the two: mass number - atomic number = no. of neutrons p + n - p = no. of neutrons = n
The atomic number of nitrogen is 7. So there are 7 protons and 7 electrons. The number of neutrons depends on the isotope. N-14 has 7 neutrons. N-15 has 8 neutrons. Number of neutrons = Mass number - Atomic number.
The number after the "N", 15, is the mass number. The mass number is the sum of the number of protons and the number of neutrons. So, if you find a periodic table, you can find the atomic number, which is the same as the number of protons. Because the atomic number of nitrogen is 7, it has 7 protons. Then we take the mass number (protons + neutrons) and subtract the number of protons to find the number of neutrons. 15 - 7 = 8 neutrons in 15N.
The mass number of an atom is the sum of its protons and neutrons. In this case, nitrogen (N) has 7 protons and a mass number of 14. So, the number of neutrons in an atom of nitrogen is 14 - 7 = 7 neutrons.
p,n =31,38 P=31 (from Periodic Table) N= 68.926-31=37.926
same number as the protons: 31
The atomic number is 21: The mass number is the sum of protons and neutrons, while the atomic number is the number of protons, designated n. From the statement of the problem, n+n+3 = 45, or 2n = 42, or n=21.
The mass number (A) is the sum of protons (Z) and neutrons (N) in an atom. It is represented as A = Z + N. The atomic number (Z) represents the number of protons in the nucleus of an atom, which determines the element's identity, while the neutron number (N) represents the number of neutrons in the nucleus.
equal to number of protons
Atomic number is the equivalent of the number of protons in an atomic nucleus.
No, only in special cases.Generally you'd also like to know the mass number (m) to calculate the neutron number (n) from the atomic number (z)m = n + z, so n = m - z(Remember that atomic number z = p which is the number of protons, so also valid:m = n + p, so n = m - p )