I believe the answer would be C
Fe3N2, also known as Iron (II) nitride, is an ionic compound.
Ionic compounds are compounds that consists of metals and non-metals bonded with ionic bonds. The metal ion gives up electron(s) to the non-metals.
Since iron is a metal and nitrogen is an non-metal, the bond they would form would be an ionic bond. Iron gives up 2 electrons to form iron(II) ion, while nitrogen gains 3 electrons to form nitride ion. Since one iron cannot let a nitrogen gain 3 electrons, so in the compound, there would be 3 iron (ii) ions that has given up 6 electrons in total while 2 nitride ions have gained 6 electrons in total.
I would say it is A because it can be a group of atoms. idk
Answer:
C. The ability to release tremendous amounts of energy
Explanation:
The decay of massive and unstable nuclei which leads to the formation of newer atoms or nuclei accompanied by the release of energy is known as nuclear fission. In a splitting reaction such as fission, energy is released from the conversion of mass.
The energy released in a fission reaction can be used to generate electricity through a series of process. Most advanced countries in the world generates their electricity through this process.
Answer: The charge on peptide chain lys-lys-his-glu at pH 7 is +1.
Explanation: A peptide chain is the chain formed from the condensation of two amino acids releasing 
molecule and forming N-terminal(Nitrogen- end) and C-terminal(Carboxyl-end). The bonds formed are known as peptide bonds.
Here 4 amino acids join together forming a peptide chain
In this peptide chain N-terminal is from lysine (lys) and C-terminal is from Glutamic acid (Glu).
At pH=7,
- The carboxyl (-COOH) groups will be deprotonated that means they will not have H-atoms and have (-1) charge.
- The Amino (
) groups will be protonated that means they have H-atoms and have (+1) charge.
So, there are 3 amino groups present each having (+1) charge and 2 carboxyl groups each having (-1) charge.
Total charge on peptide chain = 
= +1
