wouldnt it just be Si
The superscript is the mass number (28) and the subscript is the atomic number (14).
The subscript (19) indicates that this atom has 19 protons (as well as 19 electrons). The supersript (40) denotes that it has 40 protons and neutrons, hence we can infer that it has 21 neutrons.
the number of protons and neutrons in its nucleus
A mass number is the total number of protons and neutrons found in an atom.To find the mass number, you must know the number of neutrons in that particular isotope of the element and then add the atomic number (same as the number of protons) to it.When this number is definite it is called a nuclide and the symbol is written with a superscript giving the mass number and a subscript giving the atomic number (number of protons) placed in front of atomic symbol: 2311Na. It can also be written after the elements name, sodium-23.Do not confuse this with the atomic number, which is the number of protons..
3
18Al13
That seems to be an invalid notation. The subscript refers to the number of protons (5=Boron), but 'C' refers to the element (Carbon). Ignoring the 'C', Protons: 5 (Boron) Neutrons: 13-5= 8 Neutrons Electrons: 4+5= 9 Electrons
The subscript (19) indicates that this atom has 19 protons (as well as 19 electrons). The supersript (40) denotes that it has 40 protons and neutrons, hence we can infer that it has 21 neutrons.
the number of protons and neutrons in its nucleus
A nuclide is an atomic species, having a defined number of protons, neutrons and also electrons on the orbit.
Silicon has 14 protons and 14 neutrons. -I hope this helped-
3
This is a stable isotope of sulfur: 1616S.
18Al13
A mass number is the total number of protons and neutrons found in an atom.To find the mass number, you must know the number of neutrons in that particular isotope of the element and then add the atomic number (same as the number of protons) to it.When this number is definite it is called a nuclide and the symbol is written with a superscript giving the mass number and a subscript giving the atomic number (number of protons) placed in front of atomic symbol: 2311Na. It can also be written after the elements name, sodium-23.Do not confuse this with the atomic number, which is the number of protons..
Atomic mass is equal to the number of protons + neutrons present in the nuclide. The atomic number is defined as the number of protons in the nuclide. Therefore to find the number of neutrons use the formula: atomic mass = #protons + # neutrons solving for # of neutrons you get: # neutrons = atomic mass - # protons plug in the given values: #neutrons = 31 - 15 # neutrons = 16
Any atom with 23 protons in each nucleus is a vanadium atom and therefore has the atomic symbol V Also, any atom with 23 protons and 31 neutrons has a mass number of (23 + 31) or 54. Therefore, the atom may be described as an atom of "vanadium-54". There is a shorter symbol that is usually preferred, but it is impossible to write within the typographical constraints of this WikiAnswers program. That symbol is the letter "V" with both a superscript of "54" and a subscript of "23" on the left side of but adjacent to the letter V.
You would get 18O, a stable nuclide with isospin 1.