Chemistry help?

Consider Ca-40, Ca-41, K-41, and Ar-41.
a. which of these are isobars and which are isotopes?
b. What do Ca-40 and Ca-41 have in common?
c. correct the statement (if it is incorrect): Atoms of Ca-41, K-41, and Ar-41 have the same number of neutrons.

Answer:
isobars:having same atomic mass but difrent atomic number.
so ca-41,k-41,ar-41 r isotopes
isotopes:having same atomic number.so ca-40 and ca-41.
ca-40 and ca-41 hav common atomic number as is obvious frm above
nope.ca-41 has 21 neutrons,K-41 has 22 neutrons,Ar-41 has 23 neutrons.Just use Neutrons=Mass number-Atomic number
a-Isobars Ca-40 , K41 the other isotopes
b-same number of electrons or same electron config
c-Atoms of Ca-41, K-41, and Ar-41 dont have anything in common

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