Answer:
7
Explanation:
The mass number is neutrons plus protons
I don’t know if I am right but I think it is symbol for the first one and the second one is formula.
Food that contains nuts should be prepared last
PbH4 will be formed as a result of a polar covalent bond between the H and the Pb.
Since H is more electronegative than the Pb, it is, thus, expected that the H would be able to pull the electron charge towards itself. This will result in the H being negative.
Based on this:
PbH4 would be expected to <span>have polar covalent bonds with a partial negative charges on the H atoms. </span>
C burning coal in a furnace