Which scientist is responsible for the theory that explains why properties of elements recur in a periodic fashion?
A) Bohr
B) Galileo
C) Dalton
D) Avogadro
E) Mendeleev
Correct Answer:
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Q47: Which of these is a nonmetal?
A) Mg
B)
Q48: Elements belonging to the same group have
Q49: Which of these elements has three valence
Q50: The elements Li, Na, K, Rb, and
Q51: What is the total number of electrons
Q53: Which of the following is true?
A) Carbon
Q54: He has the same number of valence
Q55: The elements of the group 1 A
Q56: Which of the following elements is not
Q57: The elements of the group 7A will
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