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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