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1. Which of these models are corrected?
A
Thomson's model, Rutherford's model, Dalton's model
B
Bohr's model, Newton's model, Thomson's model
C
Thomson's model, Rutherford's model, Bohr's model
2. Which of these carachteristics are correct about the Dalton's theory?
A
All matter is made of molecules, they are visible
B
Dalton proposed his model in 1810
C
A chemical reaction is a rearrangement of atoms
3. What is a cation?
A
When an atom loses electrons
B
When the atom have negative charge
C
When the atom have negative charge and gains electrons
4. Which of these features are correct about the Bohr's model?
A
Most of the volume of an atom is a empty space
B
If the electron in an excited state emits energy
C
The atom wasn't an indivisible particle
5. What is an isotope?
A
Atoms of the same element with the same atomic number, but different mass number
B
Atoms of the same mass number but different atomic number
C
The isotopes don't have the same number of protons but they have the same number of neutrons
6. What is the electron configuration of Rb
A
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
B
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
C
1s2 2s2 2p5 3s2 3p6 3d10 4s2 4p6 5s2
7. The charge of an electron is:
A
Bigger than the one of a proton
B
The same than proton charge but with contrary sign.
C
Lower than the one of a proton