Question

1.hydrogen mass number is atomic number is 1 find the number of protons electrons and neutron
2.oxygen mass number is 16 electrons are eight find the number of protons neutrons and atomic number
3. sodium atomic number is 11 and neutron is 12 find Mass number protons neutrons ​

Answer 1

Ans.1) The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic number is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.

Ans.2) 8

Mass number equals number of sub atomic particles in the nucleus.

Atomic number gives the number of protons, which equals the number of electrons. The atomic number for oxygen is 8, so the atom has 8 electrons and 8 protons.

Protons and neutrons are found in the nucleus, so the number of neutrons is found by subtracting the proton number from the mass number I.e. 16 - 8 = 8

Oxygen exists in isotopic form and has an isotope with mass number 18. This atom will have 10 neutrons as 18 - 8 = 10

Ans.3) To find atomic number (or number of protons), you subtract the number of neutrons from the mass (mass number-neutrons). We can ignore the mass of the electrons because they are so small their masses are negligible. So in your case, 23–12=11. The element with 11 protons is Na (sodium).

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