Chlorine 35.512/8/2023 For example, in Cl-35, the atomic mass is 35 and the atomic number is 17 whereas in Cl-37, the atomic mass is 37 and the atomic number is 17. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. of electrons but they have different atomic mass. Element Chlorine (Cl), Group 17, Atomic Number 17, p-block, Mass 35.45. Note: Isotopes are the species in which two or more compounds have the same atomic number or no. From the above calculation, it is proved that the atomic mass of chlorine is taken as 35.5u. So, now we will calculate the average atomic mass of chlorine i.e. We know that chlorine-35 is found abundantly more than chlorine-37 with a ratio of 3:1 or 75% and 25% respectively. ![]() ![]() For calculating numerical and in many reactions, we use the atomic mass of chlorine is 35.5u because when we calculate the average atomic mass the value comes to be 35.5u. To calculate the ratio of abundances of the given isotopes. The average atomic masses are calculated by multiplying atomic masses with their respective relative abundance. The atomic mass of the isotopes is 37u and 35u but they have the same atomic number or number of electrons i.e. So, there are two isotopes of chlorine atom in which there are two masses 35 and 37, denoted as Cl-35 and Cl-37. The formation of the isotopes occurs due to the difference in neutrons in the atom because the difference in the neutrons causes a difference in the atomic mass and this is the reason for the formation of the two isotopes of chlorine. In nature, there are only two isotopes of Cl which exists i.e. There are two isotopes of the chlorine which have an atomic mass of 35 and 37 and they are found naturally on the earth with a percentage of 75% and 25% respectively. 17 and it is present in the 17 groups of the halogens in period 3. The reason for the atomic mass of chlorine taken as 35.5u and not as 35u because of the presence of isotopes.
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