In an atom $_{13} A l^{27}$ number of protons is (a), electron is (b) and neutron is (c). Hence their ratio will be: [in order c : b : a]

13 : 14 : 13

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13 : 13 : 14

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14 : 13 : 13

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14 : 13 : 14

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Solution

The correct option is B 14 : 13 : 13
The atomic number is 13 and the mass number is 27.
The number of protons $a = 13$
The number of electrons $b = 13$
The number of neutrons $c = 27 - 13 = 14$
The ratio $c : b : a = 14 : 13 : 13$

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