Which of the following statements is correct?

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(B) . Isotopes are not always radioactive; many are stable.$B$. $\beta$-rays consist of high-energy electrons,which are negatively charged particles.

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$\beta$-rays are always negatively charged particles

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(B) . Isotopes are not always radioactive; many are stable.$B$. $\beta$-rays consist of high-energy electrons,which are negatively charged particles. This statement is correct.$C$. $\alpha$-rays consist of helium nuclei $(He^{2+})$,which are positively charged.$D$. $\gamma$-rays are electromagnetic radiation with no charge,so they are not deflected by magnetic or electric fields.

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