Question

the atomic number of three elements A,B & C are 12,18, & 20 respectively.state , giving reason,which two elements will show similar properties​

Answer 1

A= carbon, B= Argon., C= calcium..

the argon and calcium are having similar properties..because..

*argon have 18 protons.,and 22 neutrons,but in case of calcium. it have 20. proton and 20 neutron..so it have same atomic mass of 40.

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