An element contain 20 neutron in the nucleus and 19 electron around it. it contains proton and its atomic number is__ and mass number is_.

19, 19

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Solution

Number of electrons in a neutral atom = the number of proton = 19
The mass number of an element= number of protons + the number of neutrons in the nucleus = 19+20=39
An element contains 20 neutrons in the nucleus and 19 electrons around it. it contains 19 protons and its atomic number is 19 and its mass number is 39.

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