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They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. Overlapping red and blue balls in the center with a circular fuzzy green cloud outside them. What experimental evidence led to the development of this atomic model from the one before it?
Equations were used to identify regions around the nucleus where electrons would likely be.
Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?
strontium, calcium, magnesium
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