Example: Ca2+, Zn2+, Ag1+ Lithium atom Lithium ion Atomic number: Atomic number: Mass number: Mass number: Protons: Protons: Neutrons: Neutrons: Electrons: Electrons: Lithium atom Lithium ion Cation/Anion: Ion symbol: Beryllium atom Beryllium ion Atomic … Have gained electrons Ion symbol: To write the ion symbol, you must write the element symbol with the charge written on the top right. Unreacted atoms are neutral--they have the same number of protons as neutrons. Example \(\PageIndex{2}\): Formation of Ions. When it gives an electron to iodine, it has 19 protons and 18 electrons, which gives it a positive charge. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. In I-133 there would be 80 neutrons. Magnesium’s position in the periodic table tells us that … Predict which forms an anion, which forms a cation, and the charges of each ion. Iodine has 53 electrons. Give the symbol and name for the ion with 34 protons and 36 electrons. To find the number of neutrons, just subtract the mass number with the number of protons 131 - 53 = 78 neutrons. I- ion is formed when one electron is added to iodine atom. Write the symbol for each ion and name them. A positively-charged ion or cation has more protons than electrons. So I- (or iodide ion) has 54 electrons. The chemical symbol for Iodine is I . There is a simple way of checking this kind of problem simply find the atomic number, atomic number always is the number of protons. This worked chemistry problem demonstrates how to determine the number of protons and electrons in an ion. If N gains 3 electrons from other atoms, why is it written N-3 (with a – 3) It will have 7 protons, and 10 electrons, so it will have a negative charge of 3. Se 2−, the selenide ion. If Li loses an electron to another atom, why is it written Li +1 (with a +1) It will have 3 protons, but only 2 electrons, so it will have a positive charge of 1. Iodine has 53 protons. Solution. 3. This number is the atomic number of the element. Electron transfer reactions result in formations of ions because the charges in an atom become unbalanced. The atomic number of an element tells you how many protons the atoms of that element have in their nucleus. Effects. For atomic ions, the key points to keep in mind are: A neutral atom has the same number of protons and electrons. Iodine 17 7 Gain 1 electron I-1 Anion Questions: 1. Iodine has 53 protons and will have 53 electrons if its a neutral atom. Magnesium and nitrogen react to form an ionic compound. Answer . The Double Replacement … Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. 53 electrons (unless it is an Ion) 77 neutrons. Allright Iodine has- 53 protons. The proton number is the atomic number of the … Similarly, through gaining an electron, iodine becomes negatively charged. 2.