Chemistry
Why do 3517Cl and 3717Cl have the same chemical properties? In what respect do these atoms differ?
Atomic Structure
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Answer
Isotopes have the same atomic number i.e., the same number of electrons and protons and hence the same electronic configuration. Chemical properties are determined by the electronic configuration of an atom. Thus, the isotopes of an element are chemically alike.
Isotopes have different mass numbers [A] due to different number of neutrons. 3517Cl has 18 neutrons whereas 3717Cl has 20 neutrons. Due to different atomic masses these atoms differ in their physical properties like density, melting point, boiling point, etc.
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