Multiple Choice
About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?
A) carbon, sodium, hydrogen, nitrogen
B) carbon, oxygen, phosphorus, hydrogen
C) oxygen, hydrogen, calcium, nitrogen
D) carbon, hydrogen, nitrogen, oxygen
Correct Answer:
Verified
Correct Answer:
Verified
Q9: Which of the following are compounds?<br>A) H₂O,
Q10: Refer to the following figure to answer
Q11: Which bond or interaction would be difficult
Q12: When are atoms most stable?<br>A) when they
Q13: Refer to the following figure to answer
Q15: Compared with ³¹P, the radioactive isotope ³²P
Q16: Trace elements are those required by an
Q17: a(n. _ has charge but negligible mass,
Q18: Carbon-14 has the same _.<br>A) atomic number
Q40: Oxygen has an atomic number of 8