Ca
Calcium
The nuclear symbol would be ^44Ti, representing the element titanium, since the atomic number (number of protons) is 22 (20 electrons + 2 protons) and the mass number (protons + neutrons) is 44 (22 protons + 24 neutrons).
20Ca44
The fluorine isotope with 9 neutrons is fluorine-18, and its chemical symbol is ^18F.
The isotope symbol for fluorine with 9 neutrons is ^18F, where 18 is the atomic mass number (protons + neutrons) and F is the chemical symbol for fluorine.
I think that's B, the symbol for the element boron. Boron has 5 protons and 5 electrons. The most common isotope has 6 neutrons. The other main isotope has only 5 neutrons.
70Ga is the symbol for the isotope gallium-70. It has 31 protons, 39 neutrons, and 31 electrons.
The element with 30 neutrons and 15 electrons is phosphorus. The number of neutrons in an element is determined by subtracting the atomic number from the atomic mass. Since phosphorus has an atomic number of 15 and an atomic mass of approximately 31, it has 30 neutrons.
204/80 Hg^2+
The element with 30 neutrons and 15 electrons is phosphorus. The number of neutrons in an element is determined by subtracting the atomic number from the atomic mass. Since phosphorus has an atomic number of 15 and an atomic mass of approximately 31, it has 30 neutrons.
The symbol for a sodium isotope with 12 neutrons would be "Na-23". This notation indicates the element symbol "Na" for sodium and the total number of protons and neutrons in the nucleus (12 neutrons + 11 protons = atomic mass number 23).
The fluorine isotope with 9 neutrons is fluorine-18, and its chemical symbol is ^18F.
One way to write the isotope of bromine with 10 more neutrons than its atomic number is 81Br (atomic number 35 + 10 = 45 neutrons). Another way is to use the mass number notation and write it as bromine-81, where the mass number is the sum of protons and neutrons.
Antimony (symbol Sb) has three isotopes: 121Sb, 123Sb, and 125Sb. The 121 isotope has 70 neutrons, and the 123 isotope has 72 neutrons. The 125 isotope isn't stable and will decay, but it has 74 neutrons.
I think that's B, the symbol for the element boron. Boron has 5 protons and 5 electrons. The most common isotope has 6 neutrons. The other main isotope has only 5 neutrons.
Polonium (symbol, Po) is an element with 84 protons and 84 electrons. In Po-185 isotope, there are 101 neutrons.
The isotope symbol for fluorine with 9 neutrons is ^18F, where 18 is the atomic mass number (protons + neutrons) and F is the chemical symbol for fluorine.
This is the isotope plutonium-240: 24094Pu.
It is the Sr+2 ion. It is formed by a Sr atom.
The symbol Mn indicates a manganese atom, which always has 25 protons. The electroneutrality required for any atom requires the presence of 25 electrons to balance the electrical charge of the 25 protons. The mass number, 52 in this instances, is the sum of the numbers of protons and neutrons. Therefore, the number of neutrons in the isotope is 52 - 25 or 27.