How many neutrons and protons are there in the following nuclei? \(_{6}^{13}\textrm{C}\), \(_{8}^{16}\textrm{O}\), \(_{12}^{24}\textrm{Mg}\), \(_{26}^{56}\textrm{Fe}\), \(_{38}^{88}\textrm{Sr}\).
Concept Used:
For a nucleus AZX:
Number of protons = Z
Number of neutrons = A − Z
(i) 136C
Protons = 6
Neutrons = 13 − 6 = 7
(ii) 168O
Protons = 8
Neutrons = 16 − 8 = 8
(iii) 2412Mg
Protons = 12
Neutrons = 24 − 12 = 12
(iv) 5626Fe
Protons = 26
Neutrons = 56 − 26 = 30
(v) 8838Sr
Protons = 38
Neutrons = 88 − 38 = 50
Final Answer:
136C → Protons = 6, Neutrons = 7
168O → Protons = 8, Neutrons = 8
2412Mg → Protons = 12, Neutrons = 12
5626Fe → Protons = 26, Neutrons = 30
8838Sr → Protons = 38, Neutrons = 50
Considering Bohr’s atomic model for hydrogen atom :
(A) the energy of H atom in ground state is same as energy of He+ ion in its first excited state.
(B) the energy of H atom in ground state is same as that for Li++ ion in its second excited state.
(C) the energy of H atom in its ground state is same as that of He+ ion for its ground state.
(D) the energy of He+ ion in its first excited state is same as that for Li++ ion in its ground state.