ECS Physical Science Chapter 4 Atoms: Question Preview (ID: 27580)


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In the modern atomic theory, electrons
a) act like waves. b) orbit the nucleus like a planet around the sun. c) are in the nucleus. d) have the same mass as neutrons.
A region in an atom where there is a high probability of finding electrons is called
a) a nucleus. b) a proton. c) an orbit. d) a particle.
A unit or quantum of light is
a) an electron. b) a photon. c) a proton. d) a electron.
The electrons that determines the atom's chemical properties are called
a) chemical electrons. b) valence electrons. c) first orbital electrons. d) photons.
The second energy level has 1 s orbital and 3 p orbitals. How many electrons can this energy level hold?
a) 2 b) 8 c) 18 d) 32
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.
How many electrons can the first energy level hold?
a) 2 b) 6 c) 8 d) 18
According to the modern model of the atom,
a) moving electrons form an elctron cloud. b) electrons and protons circle neutrons. c) neutrons have a postive charge. d) the number of protons for a given element varies.
Carbon has 6 protons. How many electrons does it have?
a) 2 b) 8 c) 10 d) 6
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) mole b) hydrogen c) isotope d) energy level.
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