Key Terms: True or False
Key Ideas: Multiple Choice
Short Answer
Definitions
Miscellaneous
100
(Electrons) have a positive charge.
F-Protons
100
The discovery of which particle proved that the atom is not indivisible? a) Proton b) Neutron c) Electron d) Nucleus
c) Electron
100
What force holds electrons and atoms?
Electromagnetic force
100
In your own words write a definition for the word electrons
a subatomic particle that has a negative charge
100
Calculate the Atomic Mass of the gallium, which consists of 60% gallium-69% and 40% gallium-71.
(0.60 x 69 amu) + (0.40 x 71 amu) = 69.8 amu
200
All atoms of the same element contain the same number of (neutrons)
False Protons
200
How many protons does an atom with an atomic number of 23 and a mass number of 51 have? a) 23 b) 28 c) 51 d) 74
a) 23
200
In two or three sentences describe Thomson's plum pudding model of the atom.
The plum-pudding model describes the atom as a lump of positively charged material with negatively charged particles throughout. The positively charged material is like the pudding, and electrons are like plums in the pudding.
200
In your own words write a definition for the word nucleus.
the central region of the atom, which is made up of protons and neutrons
200
In your own words, write a definition for the term atom.
the smallest part of an element that has the properties of that element
300
(Protons) have no electrical charge
False Neutrons
300
In Rutherford's gold foil experiment, Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because...... a) most of the particles pass straight through the foil b) some particles were slightly deflected c) a few particles bounced straight back d) all the above
d) all of the above
300
In your own words write the definition for the word of electron cloud.
a region around the nucleus of an atom where electrons are likely to be found
300
In your own words write the definition of the word atomic mass
the mass of an atom expressed in atomic mass units
400
(The Atomic Number) of an element is the number of protons and neutrons in the nucleus
False, Mass Number
400
Which of the following determines the identity of an element? a) atomic number b) mass number c) atomic mass d) overall charge
a) atomic number
400
In your own words write the definition for the word atomic mass unit.
a unit of mass that describes the mass of an atom or molecule
500
The (mass number) is an average of the masses of all naturally occurring isotopes of an element
False, Atomic Mass
500
Isotopes exist because atoms of the same element can have different numbers of...... a) protons b) neutrons c) electrons d) none of the above
b) neutrons
500
In your own words write the definition for the word proton.
a subatomic particle that has a positive charge and that is found in the nucleus of an atom
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