Answer:
17. D
18. B
19. A
20. C
21. F
22. H
23. E
24. G
25. i
Explanation:
17. Democritus was a Greek philosopher who was the first person to use the term atom (atomos: meaning indivisible).
18. Obvious
19. The plum pudding model (also known as Thomson's plum pudding model)
20. Obvious din
21. obvious din
22.Atoms are the basic units of matter.
23.obvious
24. mass number or atomic mass, in nuclear physics, the sum of the numbers of protons and neutrons.
25. obvious
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