Ankita Nov 03, Because of the presence of isotopes. Consider a chlorine atom, it will have 17 protons and hs two isotopes they are chlorine — 35 and chlorine — Upvote 6. Amrutha Anoop Nov 03, The reason for the atomic mass of chlorine taken as Isotopes are defined as variants of a particular element where these variants will have the same number of protons but differ in the number of neutrons in the atom..
A number of protons are 17 and the number of neutrons are It happens in nature about 25 per cent of the time. Atomic mass in an atom or group of an atom is the sum of the masses of protons, neutrons and electrons. For an element relative atomic mass is the average mass of the naturally occurring isotopes of that element relative to the mass of an atom of 12C.
Thus the atomic mass of chlorine is taken as Upvote 4. This discussion on Why chlorine has atomic mass The Questions and Answers of Why chlorine has atomic mass If the answer is not available please wait for a while and a community member will probably answer this soon. You can study other questions, MCQs, videos and tests for Class 9 on EduRev and even discuss your questions like Why chlorine has atomic mass Apart from being the largest Class 9 community, EduRev has the largest solved Question bank for Class 9.
Upgrade to Infinity. Video min. All three isotopes of hydrogen have identical chemical properties. This is because the number of electrons determines chemical properties, and all three isotopes have one electron in their atoms.
Relative atomic masses can be found in the periodic table. They have the symbol A r. Take care not to confuse mass numbers and relative atomic masses:. For example, the relative atomic mass of chlorine is This is because chlorine contains two different isotopes, chlorine and chlorine The table shows the mass numbers and abundances of the isotopes of copper in a naturally-occurring sample.
What is the relative atomic mass of copper? In a sample of copper atoms, there would be 70 copper atoms and 30 copper atoms.
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