Which of the following pairs is/are correctly matched? 1. Isotopes :

1.	Which of the following pairs is/are correctly matched? 1. Isotopes : Atoms with same atomic number but different atomic mass. 2. Isobars : Atoms with same number of neutrons but different atomic number. 3. Isotones : Atoms with same mass number but different atomic number. Select the correct answer using the codes given below : (a) 1, 2 and 3 (b) 1 only (c) 1 and 2 only (d) 2 only
Answer» The correct option is: (B) Explanation: Isotopes are variants of a particular chemical element: while all isotopes of a given element share the same number of protons and electrons, each isotope differs from the others in its number of neutrons. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively

Which of the following pairs is/are correctly matched? 1. Isotopes : Atoms with same atomic number but different atomic mass. 2. Isobars : Atoms with same number of neutrons but different atomic number. 3. Isotones : Atoms with same mass number but different atomic number. Select the correct answer using the codes given below : (a) 1, 2 and 3 (b) 1 only (c) 1 and 2 only (d) 2 only

Answer»

The correct option is: (B)

Explanation:

Isotopes are variants of a particular chemical element: while all isotopes of a given element share the same number of protons and electrons, each isotope differs from the others in its number of neutrons. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. The atomic number of carbon is 6, which means that every carbon atom has 6 protons, so that the neutron numbers of these isotopes are 6, 7 and 8 respectively

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