An isotope is an element with a different number of neutrons than protons. Neutrons have mass and therfore elements can have different masses while being the same element.
B. Rovers are what you are looking for
Answer: a.KOH
Potassium hydroxide is an ionic compound where the K+ is the cation and OH−is the anion. At the same time, the compound also contains a covalent bond since the anion, OH−is formed from electron sharing between the O and H atoms.
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Explanation: