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Ler's Try
Multiple Choice: Choose the letter of the best answer. Write the chosen letter
on a separate sheet of paper.
1. What is the model developed after J.J. Thompson discovered electrons, a particle smaller
than an atom? It shows electrons floating freely in a positive region.
A Rutherford model
C. Plum Pudding model
B. Democritus's model
D. Quantum Mechanical model
2. What atomic model was depicted similar to a planetary/solar system?
A Democritus
C. Ernest Rutherford
B. Niels Bohr
D. Joseph Thomson
3. What contribution did John Dalton make to atomic theory?
A. He discovered that atoms had nuclei.
B. He discovered that every atom was positively charged.
C. He discovered that atoms could be divided into smaller parts,
D. He discovered that elements consisted of one type of atom.
4. In the gold foil experiment, most of the positively charged alpha particles passed through
the gold foil, but some were deflected or bounced back. What did we conclude because
of this?
A. Light is a wave, not a particle.
B. Atoms are small indivisible spheres.
C. Atoms have negatively charged particles which orbit the nucleus,
D. Atoms are mostly empty space with a small, dense, positive center.
5. What is an atom that has gained or lost an electron?
A. lon
C. Bohr model
B. Isotope
D. Valence electron
6. What is the smallest unit of matter? It is composed of protons and neutrons, held together
in the nucleus, and electrons around the nucleus in different electron orbitals, which form
an electron cloud?
A atom
B, cell
C. electron
D. nucleus
7. Which of the following most correctly determines the atomic number of an element?
A. number of protons
​

Sagot :

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Answer:

1. What is the model developed after J.J. Thompson discovered electrons, a particle smaller  than an atom? It shows electrons floating freely in a positive region.

  • C. Plum pudding

​2. What atomic model was depicted similar to a planetary/solar system?

  • B. Niels Bohr

3. What contribution did John Dalton make to atomic theory?

  • D. He discovered that elements consisted of one type of atom.

4. In the gold foil experiment, most of the positively charged alpha particles passed through  the gold foil, but some were deflected or bounced back. What did we conclude because  of this?

  • D. Atoms are mostly empty space with a small, dense, positive center.

5. What is an atom that has gained or lost an electron?

  • A. Ion

6. What is the smallest unit of matter? It is composed of protons and neutrons, held together  in the nucleus, and electrons around the nucleus in different electron orbitals, which form  an electron cloud?

  • A. Atoms

7. Which of the following most correctly determines the atomic number of an element?

  • A. number of protons

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