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Answer 1

Answer:

Number of proton in beryllium is 4 , no. of Nutron is 5 and no. of Electron is 4.

mass of Florine is 19 units , No. of proton is 9 and Electron is 9.

atomic number of sodium is 11 , mass is 23 units , no. of proton is 11 .

Number of protons in aluminium is 13, number of neutron is 14 , atomic number is 13.

Atomic no. of Phosphorous is 15, no. of Electron is 15 and no. of Neutron is 16.

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