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matter is anything and everything that takes up space. Matter has phases called solid liquid ang gas (also Plasma), liquid takes the form of whatever its in because it has no solid form to it, but it takes up the space in whatever its in, a solid is something that's molecules are packed together they still move but not very fast. gas molecules move all over the place either way all three states of matter have matter in them.
The atom of alkaline earth metal has one more proton and one more electron than the alkali metal that is next to it to the left on the periodic table. Then the atomic number of the alkali metal is one unit less than the atomic number of the alkaline earth metal next to it
