My daughter loves the ARVA science experiments. I'm not so keen on them but she's a scientist at heart and loves to make the messes. Here she is with a modeling clay model of an oxygen atom she made yesterday.
She took modeling clay and made 8 blue balls and 8 green balls for the protons and neutrons, and wrapped them up in plastic wrap to represent the nucleus. Then she made 8 small yellow balls and attached them with toothpicks to represent the electrons surrounding the nucleus.
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