1-. Because Group 7A elements have 7 electrons in their valence shell, they need 1 more electron to complete the octet. Thus, it is generally true that all Group 7 electrons have an oxidation number of 1-. This also explains why electron affinity is largely the highest for Group 7A and lowest for Group 1A.
Because it is used for building - making concrete and cement - and the manufacture of glass, steel and iron.
3H₂ + N₂ = 2NH₃
V(H₂)/3 = V(NH₃)/2
V(NH₃)=2V(H₂)/3
V(NH₃)=2*4.50/3=3.00 L
3.00 L
Answer:
Explanation:
When adding or subtracting values, you must round your answer to the same "place" as the measurement with its last significant figure furthest to the left.
That is, you round off to the same number of decimal places as the measurement with the fewest decimal places.
The measurement of 101 g has no digits after the decimal point, so you round off the answer to give no digits to the right of the decimal.