Use words from the box to complete the sentences about beryllium.
Each word may be used once, more than once or not at all.
electrons
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negative
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neutral
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neutrons
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nucleus
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positive
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protons
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shells
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An atom of beryllium has a central ............................................................ that contains particles
called ............................................................ and ............................................................ . Around these
particles there are ............................................................ orbiting in ............................................................ .
An atom of beryllium has no charge because it contains equal numbers
of ............................................................ and ............................................................ .
The particles with the lowest mass in an atom of beryllium are called ............................................................ .