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Class 12 Physics (Part Ii) Chapter 12 Atoms Quiz 1 (25 MCQs)

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1. What is the maximum number of electrons the second shell can hold?
2. Which state of matter takes the shape of the container that it is in?
3. What is an atomic nucleus?
4. How are atoms identified?
5. A field of science that studies atoms and molecules are called
6. In a fluorescent tube, electrons are emitted from the:
7. In a fluorescent tube, the UV photons are:
8. Extremely tiny particle that makes up matter
9. How much smaller or bigger are electrons than neutrons and protons
10. Which Dalton's postulate is this ..... "Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction."
11. At the distance of closest approach of an $\alpha$
12. An analytical chemist looks at
13. In a fluorescent tube, the visible light photons are:
14. In a fluorescent tube, the atomic electrons in mercury are:
15. Why can't atoms be seen?
16. Which of the following quantities has the same dimensions as that if Plancks constant:
17. Neutrons are important because .....
18. Who stated this Law? ..... "In a chemical substance the elements are always present in definite proportions by mass"
19. This is the written out expression for a substance and contains each element in it and the number of atoms for that element.
20. A biochemist looks at
21. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common?
22. In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:
23. What subatomic particle is represented by this symbol (+):
24. What is the main difference between an atom and a molecule?
25. Which subatomic particle orbits the nucleus?
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