how to calculate atomic number and mass number

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Q. How to calculate atomic mass?please remember that no.of neutron plus protons is called mass number.

An ion $X^{2 +}$ contains 18 electrons and 20 neutrons. Calculate the atomic number and mass no. of element X. Name the element X.

Q. The atomic number of an element is

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U with atomic number 92 and mass number 238 is radioactive and it emits alpha and beta particles to form Pb with atomic number 82 and mass number 206. Calculate the number of alpha and beta particles emitted in this conversation.

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