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Think about a metal desk and a pencil. What do these two objects always have in common?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
An atom’s mass number is 200 and its atomic number is 80. How many neutrons does the atom have?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
Beryllium is an element. What is the smallest particle of Beryllium that has all the chemical properties of calcium?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
Which of the following is not made up of atoms?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
What is the atomic mass of an atom that has 6 protons, 6 electrons, and 7 neutrons?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
The current model of the atom shows electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
Where is the nucleus located in the atom?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
Which of the following scientists added negatively-charged particles to the model of the atom?
subatomic particles
13
120
The electron cloud shows a region in which electrons are likely to be found.
an atom of Beryllium
Both are made of atoms.
J. J. Thomson
in the center
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