Ca
Calcium
20Ca44
There are a variety of isotopes that have 30 neutrons. It isn't the number of neutrons that determines an element, but the number of protons. Electrons generally balance the number of protons.
The chemical symbol for fluorine isotope with 9 neutrons is 18F (18 is a superscript).
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.
18F
204/80 Hg^2+
There are a variety of isotopes that have 30 neutrons. It isn't the number of neutrons that determines an element, but the number of protons. Electrons generally balance the number of protons.
no symbol
The chemical symbol for fluorine isotope with 9 neutrons is 18F (18 is a superscript).
1- the name then the nuclear symbol.
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.
18F
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.