Which of the following is the most abundant element in the human body?
A) hydrogen
B) oxygen
C) iron
D) carbon
E) copper
Correct Answer:
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Q9: In a molecule of oxygen, two pairs
Q11: Positively charged subatomic particles are called
A) protons.
B)
Q12: The mass number represents the number of
A)
Q13: Atoms of the same element but containing
Q15: Which of the following is sometimes used
Q16: The branch of science that deals with
Q17: When electrons are shared between one atom
Q18: Which of the following is a characteristic
Q19: Ions with a negative charge are called
A)
Q30: Which of the following is a weak
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