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