7.2 Review CC Question Preview (ID: 46201)
The Atom.
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Which of these is the smallest particle to retain the properties of an element?
a) an atom
b) a proton
c) a molecule
d) an electron
Which statement is supported by the atomic theory?
a) Atoms are made up of smaller particles called molecules.
b) Atoms are easily destroyed when matter is cooled or heated.
c) Atoms come in different sizes, but most are visible using a simple hand lens.
d) Atoms combine to make all the substances on Earth.
The current model of the atom has electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?
a) The electron cloud shows there is not empty space in an atom.
b) The electron cloud shows that electrons do not have a negative charge.
c) The electron cloud shows a region in which electrons are likely to be found.
d) The cloud shows that all the electrons combine together to form one mass.
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
a) 85
b) 125
c) 210
d) 295
Marcus wants to use two objects to compare the sizes of a proton and an electron. If he uses a basketball for a proton, which object would best represent an electron?
a) a pea
b) a beach ball
c) a soccer ball
d) a bowling ball
Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?
a) a proton from a calcium atom
b) an electron from a calcium atom
c) a molecule that contains calcium
d) an atom of calcium
An atom of the element gallium (Ga) has 31 protons and 39 neutrons. What is the atomic number of gallium?
a) 8
b) 31
c) 39
d) 70
An atom of lead has the atomic number 82 and a mass number of 207. How many neutrons does this atom of lead have?
a) 82
b) 125
c) 207
d) 289
What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
a) 4
b) 5
c) 9
d) 13
Atoms are the building blocks of all matter. Which of the following are the building blocks of atoms?
a) elements
b) molecules
c) pure substances
d) subatomic particles
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