Question

the mass number of an element is 19. the scond shall of its atom contains 7 electron. the number of proton in its nucleus is..​

Answer 1

Answer:

9 protons will be present in its nucleus...

Explanation:

As the no. of protons in nucleus=no. of electrons present in the atom, so we will calculate no. of electrons.... as 7 electrons are present in 2nd /valence shell which means that 2 electrons will be already in first shell ,so total no. of electrons=9=total no. of protons in nucleus

Answer 2

Answer:

mass number=protons+neutrons

Explanation:

19=2x

protons=10, Neutrons =9

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