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Terms in this set (14)
What particle has a negative charge?
What particle has a positive charge?
What particle has a neutral charge?
What are alpha particles?
a. tiny, positively charged particles
b. large, positively charged particles
c. tiny, neutral particles
d. large, negatively charged particles
What atomic feature did Ernest Rutherford conclude allowed the alpha particles to pass through the gold foil?
a. electrons are found in the nucleus
b. the atom is filled with solid material
c. the atom must be mostly empty space
d. electrons move in circular orbits, or energy levels, around the nucleus
What is located in central (center) part of the atom?
b. negatively charged particles
c. electron cloud
d. the nucleus
The electrons in an atom's outermost energy level are called ______.
a. valence electrons
b. outermost electrons
c. border electrons
d. highest level electrons
Where are the protons and neutrons located in an atom?
a. electron cloud
c. around the nucleus
d. outer edge of the atom
How does the mass of a neutron compare to the mass of a proton?
a. a neutron's mass is 1/1840 of a proton
b. a neutron is 1840 times the mass of a proton
c. a neutron's mass is less than that of a proton
d. they are equal
In the modern model of the atom, where can you find electrons?
a. electron rings
b. electron cloud
d. center of atom
How did Bohr's model of the atom differ from Rutherford's?
a. Bohr's model has a nucleus made of protons, and Rutherford's model has a nucleus made of neutrons and protons
b. Bohr's model has a nucleus made of neutrons and protons, and Rutherford's model has a nucleus made of protons
How does the mass of a neutron compare to the mass of an electron?
a. a neutron's mass is 1840 times the mass of an electron
b. they are the same
c. a neutron's mass is 1/1840 of the mass of an electron
d. a neutron's mass is smaller than that of an electron
How do electrons move in an atom?
a. they move slowly in circles
b. they move in a straight line back and forth across an atom
c. they move rapidly from one place to another in an electron cloud
d. they stay at one position in an atom
Why is most of the mass of an atom found in the nucleus?
a. the nucleus contains both protons and neutrons, with each having mass 1840 times that of an electron
b. the nucleus is filled with electrons
c. the nucleus has a particle that makes it massive
d. there is positive charge in the nucleus
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