In option D, ⁴⁰₁₈Ar (Argon) has an atomic number (Z) of 18 and a mass number (A) of 40. ⁴⁰₂₀Ca (Calcium) has an atomic number (Z) of 20 and a mass number (A) of 40. Since they have different atomic numbers but the same mass number, they are isobars.
The elements of which of the following pairs are isobars?
Asked in UPSC CDS 1 2020 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
More Chemistry questions
- The two isotopes of elemental chlorine are :
- NIHONIUM, MOSCOVIUM, TEN‐ NESSINE and OGANESSON are
- The two isotopes of Uranium 235U and 238U have _____. Equal number of protons Equal number of neutrons 92 protons each
- Match List-I with List-II. List-I List-II (i) Equal to the number of (a) Radioactive isoprotons found in the nucletopes us (ii) Equal to the number of (b) Radiation unit protons and neutrons in the nucleus (c) Atomic number of a chemical ele‐ (iii) ¹H, ³²S, ¹²C, ¹²⁷I, ⁵⁹Co ment (d) Mass number (iv) Curie (Ci), Millicurie of a chemical ele‐ (mCi) ment (v) ³H, ³⁵S, ¹⁴C, ¹³¹I, ⁶⁰Co Choose the correct answer from the options given below :
- Oxygen occurs in nature in ______ isotopic forms.
- Which one of the following statements is/ are incorrect ? a. The number of protons in a nucleus is called its atomic number. b. The total number of protons and neutrons constitute its mass number.
- An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?
- The mass number of argon is 40. Which one of the following statements is correct?
