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Answer:
To my knowledge, it should be the last 2
Explanation:
1. Incorrect as atoms make up elements when they all have the same properties
2. Incorrect, an element can have other similar elements, they're ordered like that in the periodic table
3. Correct as atoms are made up of mostly space, with mass concentrated at the center of the atom, the nucleus and a few tiny electrons in orbit as proved by Rutherfords alpha particle scattering experiment
4. Correct, Atoms are known as the building blocks of matter