Question

give two reasons why ¹⁹K⁴⁰ and ¹⁹K³⁹ are isotopes of the element pottasium
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Answer 1

Answer: both are K (potassium atom), and both have same number of proton

Explanation:

Isotopes are the atoms in an element that have the same atomic number but a different atomic mass, where they have the same number of protons, but different numbers of neutrons. this leads to same chemical properties but different physical properties.