From my understanding its considered a compond
Answer: The coordination number of Cu+ is two while the coordination number of O2- is 4
Explanation:
The coordination number of an ion in a unit cell arrangement refers to the number of immediate neighboring ions of opposite charge surrounding a particular ion. In Cu2O, the charge on Cu is +1 and the charge on the oxide ion is -2. Each copper I ion is surrounded by two oxide ions while each oxide ion is surrounded by four copper I ions in each unit cell.
He valence of selenium depends on which compound it is in. Selenium is very similar to sulfur. It may have a valence of 6; example selenium hexafluoride SeF6, selenium trioxide SeO3
<span>4; example selenium tetrafluoride SeF4, selenium dioxide SeO2 </span>
<span>2; example selenium difluoride SeF2, selenium dichloride SeCl2 </span>
<span>and -2; example hydrogen selenide H2Se</span>
Answer:
The body with 2.7
has a larger volume
Explanation:
There is a missespelling in the question. The units of density cannot be g, they usually are 
In order to answer this question, we need to use the formula of the density of a body:

For body A:
Mass (M) = 5.0 g
Density (D) = 2.7 
2.7
= 5g * 1/V
V1 = 5g / (2.7
)
V1 = 1.85 
For Body B:
Mass (M) = 5.0 g
Density (D) = 8.4 
8.4
= 5g * 1/V
V2 = 5g / (8.4
)
V2 = 0.59 
So V1 is bigger than V2