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8th Grade Exam 3
Test Description: 8th grade exam 3
Instructions: Answer all questions to get your test result.
1) which of the following has the least mass
A
electrons
B
neutron
C
nucleus
D
proton
2) An atom of carbon with 6 protons, 6 electrons, and 6 neutrons would have a mass number of
A
15
B
6
C
12
D
18
3) Periodic Law States that
A
properties of elements change periodically with the elements' atomic numbers.
B
elements are either gases, solids, or liquids.
C
mercury is a liquid at room temperature.
D
some elements only stay in a liquid state for short periods.
4) the elements to the right of the zig zag line on the period table are called
A
metals
B
metalloids
C
nonmetals
D
conductors
5) most metals are.
A
dull
B
bad conductors oe electric current
C
solid at room temperature.
D
not malleable
6) how do the physical and chemical properties of the elements chanfe?
A
across each period.
B
within a family
C
within a group.
D
across each group.
7) what is necessary for substances to burn?
A
helium
B
hydrogen
C
oxygen
D
carbon
8) Mendeleev of elements that do not have individual names are called the
A
nonmetals
B
transition metals
C
alkali metals
D
alkaine-earth metals
9) Diamond and soot are very different, yet both are natuarl forms of
A
copper
B
carbon
C
nickel
D
boron
10) What elements is used to make the widely used compound in the chemical industry?
A
selenium
B
sulfur
C
polonium
D
tellurium
*select an answer for all questions
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