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Atoms And The Periodic Table
Test Description: Science
Instructions: Answer all questions to get your test result.
1) An atom’s mass number is 200 and its atomic number is 80. How many neutrons does the atom have?
A
280
B
120
C
200
D
80
2) Think about a metal desk and a pencil. What do these two objects always have in common?
A
Both are made of the same number of atoms.
B
Both have the same mass number.
C
Both are made of atoms.
D
Both are made of the same kind of atom.
3) Which of the following scientists added negatively-charged particles to the model of the atom?
A
Ernest Rutherford
B
Niels Bohr
C
J. J. Thomson
D
John Dalton
4) Beryllium is an element. What is the smallest particle of Beryllium that has all the chemical properties of calcium?
A
an electron from a Beryllium atom
B
a proton from a Beryllium atom
C
a molecule that contains Beryllium
D
an atom of Beryllium
5) Where is the nucleus located in the atom?
A
Left of center
B
inside the electrons
C
in the center
D
In the electron cloud
6) What does a box on the periodic table represent?
A
a compound
B
a period
C
an element
D
a group
7) What type of element are semiconductors?
A
liquids
B
metals
C
metalloids
D
nonmetals
8) Which describes how elements are arranged in the periodic table?
A
by increasing atomic number
B
alphabetical
C
by increasing atomic mass
D
by chemical symbol
9) Which are properties of metals?
A
Brittle and clear
B
Conductive and ductile
C
Liquid and dull
D
Gaseous and unreactive
10) Which of the following is not made up of atoms?
A
pure substances
B
subatomic particles
C
molecules
D
elements
11) What is the atomic mass of an atom that has 6 protons, 6 electrons, and 7 neutrons?
A
12
B
13
C
14
D
6
12) 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?
A
The electron cloud shows a region in which electrons are likely to be found.
B
The electron cloud shows that electrons do not have a negative charge.
C
The electron cloud shows there is not empty space in an atom.
D
The cloud shows that all the electrons combine together to form one mass.
*select an answer for all questions
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