![]() Therefore, the atomic weight of the Cl atom is 35.5 amu. Weightage of 37Cl= percentage abundance of isotope 37Cl x atomic mass of isotope 37Cl Different isotopes have different relative abundances ,chlorine 35 has a relative abundance of 75.76 ,whereas chlorine 37 has a relative abundance of 24.24. The atomic weight of chlorine given on the periodic table is 35.47 u. When chlorine isotopes are analysed by mass spectrometer, either peak M or M+2 can be obtained. Chlorine has two stable isotopes: chlorine 35 and chorine 37. Mass spectrometer has the ability to detect and separate isotopes, even those differing by a single atomic mass unit. Weightage of 35Cl= percentage abundance of isotope 35Cl x atomic mass of isotope 35Cl The peaks are for isotope 35, both 35 and 37 and for isotope 37. The results are then added to obtain the average atomic mass. ![]() The atomic mass and atomic weight are synonyms that consider the weighted average of naturally occurring isotopes of all the atoms of an element.Īn isotope’s contribution to the element’s atomic weight is given a ‘weightage’ or a ‘value’ derived from its natural abundance and the isotopic atomic mass. (Hint: atomic mass = the weighted average mass of the isotopes in the element) number of electrons number of neutrons number of protons 35Cl 17 37Cl 17 3 (b) (i)Chlorine. 2 (ii) Complete the table to show the number of electrons, neutrons and protons in each atom and ion. ![]() (i) State why these two isotopes of chlorine have the same chemical properties. The atomic mass of 35Cl is 34.969 amu, and the atomic mass of 37Cl is 36.966 amu. (a) Two isotopes of chlorine are chlorine-35 and chlorine-37. Neutrons can be added or removed from an atom and the electrons around the atom really don't care that much.Question- Chlorine has two isotopes, 35Cl and 37Cl 75.77 % of chlorine is 35Cl, and 24.23% is 37Cl. In discussing these isotopes, we use the. Neutrons don't change things greatly because they do not carry an electrical charge. Adding or removing protons changes the number and arrangement of electrons in the outer shell which changes how that atom reacts with other atoms. The number of electrons in an atom's outer shell determines the atom's chemical properties. Each proton in an atom's nucleus must be balanced with a negatively charged electron in one of the 'shells' outside the nucleus. The isotopes of chlorine with mass numbers 35 and 37 whose average mass is 35.5 exist in the ratio of: A 1:1 B 3:1 C 3:4 D 3:2 Medium Solution Verified by Toppr Correct option is B) Let the fraction of Cl 35 isomer be p. ![]() Why does changing the number of protons in an atom change which element that atom is but changing the number of neutrons doesn't? Protons carry a positive charge. An atom of chlorine-35 contains 18 neutrons (17 protons + 18 neutrons = 35 particles in the nucleus) while an atom of chlorine-37 contains 20 neutrons (17 protons + 20 neutrons = 37 particles in the nucleus).Īdding or removing a neutron from an atom's nucleus creates isotopes of a particular element. Since all atoms of chlorine contain 17 protons, chlorine-35 and chlorine-37 differ in the number of neutrons each one has. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus. The number after the name 'chlorine' is called the mass number. Adding or removing a proton from an atom's nucleus changes that atom's atomic number and creates a different element.Ĭhlorine-35 and chlorine-37 are both isotopes of the element chlorine. All atoms which contain 17 protons are called chlorine atoms. The number of protons an atom has, also known as the atom's atomic number, determines which element it is. There are 17 protons and 20 neutrons in the universe. Why aren't Chlorine-35 and Chlorine-37 two different elements?Ĭhlorine-35 and chlorine-37 are not different elements because an atom of chlorine-35 and an atom of chlorine-37 each contain the same number of protons. Consider a chlorine atom, which has 17 protons and has two isotopes: chlorine 35 and chlorine 37.
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