The horizontal rows of the periodic table are called ______?
A. Groups
B. Periods
C. Sets
D. Matrices
Who invented the battery?
A. Nicolas Carznot
B. Alessandro Volta
C. Michael Faraday
D. George Bessel
Which energy is changed by a loudspeaker into sound energy.
A. Chemical
B. Electrical
C. Light
D. Kinetic
» Read More…
According to NASA on which planet purple rocks are found?
A. Jupitar
B. Mars
C. Earth
D. Neptune
How many valence electrons are in chlorine(cl) atom?
A. Chlorine has 1 valence electrons
B. Chlorine has 2 valence electrons
C. Chlorine has 7 valence electrons
D. Chlorine has 6 valence electrons » Read More…
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