Answer:
See explanation.
Explanation:
A. 2s is incorrect, the right arrow should be pointing downwards.
B. In 2p, the last box has 3 arrows. This is invalid. Each box can only store 2 arrows(electrons). The last arrow should be moved to a 3p orbital (new box).
C. In this one, the arrows switched directions (left is down and right is up). You could fix each box or just the last one (in 3p) to point downwards.
Answer:
only 2.5 grams will be present after 16 years have passed
H2-element
HCl-compound
Na-element
Al2O3-compound
H2O-compound
Answer: someone help me with my work its so hard
Explanation: