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Atomic Structure- Part 1
Test Description: Physical Science 12 B group: Theories and Structures.
Instructions: Answer all questions to get your test result.
1) Who named the smallest particle in matter as atomos?
A
Dalton
B
Democritus
C
Aristotle
D
Rutherford
2) Which of the following is a part of Dalton's atomic theory?
A
All atoms of the same element have the same mass.
B
In a particular compound, atoms of different elements always combine in the same way.
C
All of the above.
D
All elements are composed of atoms.
3) Who's model provided the first evidence that atoms can be divided into smaller particles?
A
Bohr
B
Thomson
C
Rutherford
D
Dalton
4) Which experiment provided evidence for the existence of nucleus in an atom?
A
The Canal ray experiment
B
The Cathode ray experiment
C
The oil drop experiment
D
The gold foil experiment
5) What happens when electrons absob energy?
A
Move to a higher energy level
B
Move randomly to a higher or a lower energy level
C
Stay in the same energy level
D
Move to a lower energy level
6) How would you find the number of neutrons in an atom?
A
Subtract its atomic number from the mass number.
B
Add the numebr of protons and electrons together.
C
Subtract its mass number from the atomic number.
D
Add the number of electrons and the atomic number together.
7) What is the maximum number of orbitals and electrons at the 2nd energy level?
A
9 orbitals and 18 electrons.
B
1 orbital and 2 electrons.
C
3 orbitals and 6 electrons.
D
4 orbitals and 8 electrons.
8) How are the isotopes of an element different from one another?
A
have same number of protons but different number of neutrons.
B
have same mass number but different atomic number.
C
have same atomic number but different mass numbers.
D
Both answers 1 and 3.
9) What does an electron cloud represent in an atom?
A
Most probable locations of neutrons in the atom.
B
Most probable locations of protons in the atom.
C
Most probable locations of electrons in the atom.
D
Most probable locations of nucleus in the atom.
10) Which particle has a mass which is approximately 1/2000 that of a proton?
A
none of the above
B
neutron
C
gluons
D
electron
*select an answer for all questions
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