Question

An element have 20 electron and 20 neuton what is it's atomic no and mass no. ​

Answer 1

Answer:

An element X has atomic number 20 and it has mass number 40 a)write the electronic configuration of the element - 21079912.

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Answer 2

Answer:

Atomic Number = 20

Mass Number  = 40

Explanation:

Atomic Number = No. of protons = No. of electrons

Mass Number = Atomic Number + No. of neutrons