false, the rusting of iron can be prevented by painting, oiling, greasing or varnishing its surface.
Answer:
9
Explanation:
mass number = protons + neutrons
= 4 + 5 = 9
Answer:
See explanation
Explanation:
Electron affinity is the energy released when an extra electron is added to a neutral gaseous atom. A negative value of electron affinity indicates that energy is given out and vice versa.
Metals have positive electron affinity since electrons rarely accept electrons, so;
Na(g)+ 1e^- → Na^-(g) positive
Mg(g)+1e^- → Mg^-(g) positive
For the last case; Br(g)+ 1e^- → Br^-(g), the electron affinity for the non-metals is negative. hence the answer
B- Predict the damages due to an earthquake
