Question

Potassium,Calcium,Argon,Atoms are called _______. 1) isotopes 2) equivalent 3)isobars 4) covalent

Answer 1

isobars...............

Answer 2

Here is your answer-

3) Isobars

Reason:-Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. 

Isobars differ in atomic number(or number of protons) but have the same mass number.

So,
Potassium , Calcium,Argon, atoms are called Isobars.

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