How can a magnet attract an apple

Depending upon the type of apple, the apple will either be diamagnetic or paramagnetic i.e repel or attract towards a magnet.

Extra: The magnetic balance can detect that an apple is magnetic. For an ordinary apple the mass difference Δm = + 0.26 g (≈ 0.19% of mapple) reveals the diamagnetic properties.

Explanation:

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sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell