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ECS Physical Science Chapter 4 Atoms
Test Description: All about Atoms
Instructions: Answer all questions to get your test result.
1) In the modern atomic theory, electrons
A
orbit the nucleus like a planet around the sun.
B
act like waves.
C
are in the nucleus.
D
have the same mass as neutrons.
2) A region in an atom where there is a high probability of finding electrons is called
A
a particle.
B
a proton.
C
a nucleus.
D
an orbit.
3) A unit or quantum of light is
A
a photon.
B
an electron.
C
a electron.
D
a proton.
4) The electrons that determines the atom's chemical properties are called
A
chemical electrons.
B
first orbital electrons.
C
valence electrons.
D
photons.
5) The second energy level has 1 s orbital and 3 p orbitals. How many electrons can this energy level hold?
A
18
B
32
C
8
D
2
6) An electron moves from the ground state to an excited state when it absorbs
A
a proton
B
a neutron.
C
a photon.
D
an isotope.
7) How many electrons can the first energy level hold?
A
18
B
8
C
6
D
2
8) According to the modern model of the atom,
A
electrons and protons circle neutrons.
B
moving electrons form an elctron cloud.
C
the number of protons for a given element varies.
D
neutrons have a postive charge.
9) Carbon has 6 protons. How many electrons does it have?
A
8
B
2
C
6
D
10
10) an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons
A
energy level.
B
isotope
C
hydrogen
D
mole
*select an answer for all questions
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