What is the symbol for th eion with 9 protons and 10 electrons?
Look at the answer I gave you for Al and see if you can answer this yourself. If you have trouble, post again but tell us why you don't understand the next step to take.
So basically this would be F^1-
Very good. The fluoride ion.
To determine the symbol for an ion, we need to first identify the element based on the number of protons. In this case, we are looking for an element with 9 protons. Referring to the periodic table, we can find that element to be fluorine (F).
Next, we need to determine the charge on the ion. The charge is determined by comparing the number of protons and electrons. Since there are 9 protons but 10 electrons, we have an extra electron. As a result, the ion has a negative charge of -1.
To represent this ion, we write the symbol of the element (F) followed by the charge as a superscript. In this case, the symbol for the ion with 9 protons and 10 electrons is F^1-.