Which of the following groups of elements accounts for more than 95% of the human body by weight?
A) Carbon, hydrogen, oxygen, nitrogen
B) Calcium, hydrogen, oxygen, nitrogen
C) Carbon, phosphorus, oxygen, hydrogen
D) Calcium, phosphorus, hydrogen, nitrogen
Correct Answer:
Verified
Q5: Matter is composed of elements, which are
Q6: Exposure to ionizing radiation may
A)cloud the lens
Q7: Chemistry is important to the study of
Q8: Considering the number of valence electrons carbon
Q9: Positron emission tomography (PET)imaging follows the emission of
A)positrons.
B)electrons.
C)neutrons.
D)protons.
Q11: Which of the following isotopes has the
Q12: In a covalent bond
A)one atom loses and
Q13: The atomic number of an atom equals
Q14: Chemistry deals with
A)the composition of and changes
Q15: When K⁺ and Cl⁻ meet, they will
A)repel
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