Multiple Choice
Most elements are rare.How many elements make up approximately 99% of the mass of theearth's crust,oceans,and atmosphere?
A) 2
B) 4
C) 7
D) 10
Correct Answer:
Verified
Correct Answer:
Verified
Q15: Homogeneous mixtures of metals are called:<br>A)ions<br>B)alloys<br>C)anions<br>D)compounds
Q16: Which element is from a representative group?<br>A)Mn<br>B)Co<br>C)V<br>D)S
Q17: At room temperature the majority of metals
Q18: The sulfate group is SO<sub>4</sub><sup>-2</sup>.How many sulfate
Q19: The ultimate particle of water is a(n)<br>A)atom.<br>B)molecule.<br>C)anion.<br>D)cation.
Q21: Consider the chemical formula for one unit
Q22: All gases exist as diatomic molecules.
Q23: Which element forms diatomic molecules?<br>A)Nitrogen<br>B)Nickel<br>C)Boron<br>D)Iron
Q24: One unit of potassium oxide contains 2
Q25: Which is an alkali metal?<br>A)Calcium<br>B)Sodium<br>C)Silicon<br>D)Fluorine