There are two species represented as ³⁵Cl and ³⁷Cl. Which of the following statement is correct regarding these species ?
(a) they have different chemical properties

(b) their physical properties are the same

(c) they have the same number of protons

(d) they are isobars of the same element

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Solution

(c) they have same number of protons

As the mass numbers are different, the correct option is (c). They have the same number of protons.

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Statement 1: Isobars have same chemical and physical properties.
Statement 2: Isobars are the atoms with equal number of nucleons.

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

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