Question

Which of the following pairs is correctly
matched ?
(a) Isoelectronics N³⁻, O²⁻, Cr³⁻
(b) Isotones ₁₄Si³⁰, ₁₅P³¹, ₁₆S³²
(c) Isotopes ₂₀Ca⁴⁰, ₁₉K⁴⁰
(d) Isobars ₈O¹⁶, ₈O¹⁷, ₈O¹⁸

Answer 1

The pairs which correctly represent isobars are  Isotopes ₂₀Ca⁴⁰, ₁₉K⁴⁰.

option (C) is correct.

Explanation:

The isobars are defined as:

• Isobars are the atoms of different elements having same atomic mass but different atomic number.
• They have same number of nucleons (protons + neutrons).
• They have different number of protons (or electrons).

For example

• ₁₉K⁴⁰

• ₂₀Ca⁴⁰

Above are the two examples of isobars.

Hence the pairs which correctly represent isobars are  Isotopes ₂₀Ca⁴⁰, ₁₉K⁴⁰.

Also learn more

What are Isotopes? explain .

https://brainly.in/question/1341808

Answer 2

The correctly matched pair is: Isotones ₁₄Si³⁰, ₁₅P³¹, ₁₆S³²

Explanation:

Isotones are two or more species that contain same number of neutrons.

The given species are ₁₄Si³⁰, ₁₅P³¹, ₁₆S³²

Number of neutrons in an atom are calculated by subtracting atomic number(number of protons) from mass number.

Therefore,

Number of neutrons in ₁₄Si³⁰ = 30 - 14 = 16

Number of neutrons in ₁₅P³¹ = 31 - 15 = 16

Number of neutrons in ₁₆S³² = 32 - 16 = 16

Hence, ₁₄Si³⁰, ₁₅P³¹, ₁₆S³² are isotones.

Therefore, the correct answer is option (b)