Another name for the nucleus?
The cells control center
There isn't another name for isotopes. What it means is Any two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopic forms.
Cytosol is the closest name. According to the American Heritage Dictionary: * Cytoplasm-The protoplasm outside the nucleus of a cell. * Cytosol-The fluid component of cytoplasm, excluding organelles and the insoluble, usually suspended, cytoplasmic components. So cytoplasm is the fluid in the cell WITHOUT the nucleus, but INCLUDING the other organelles, while cytosol is the fluid in the cell WITHOUT the nucleus, and WITHOUT the other organelles