Question

answer please 10 11..........

Answer 1

i know 10 one only 
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i Isotopes
ii They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element. The electron arrangement is the same owing to same chemical properties. However they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such as boiling/melting/density etc.
iii they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such asboiling/melting/density etc. They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element.