Answer:
select all of them except they are the biggest
The correct scientific instrument is telescope.
Answer: 
Explanation:
Electron gain enthalpy is defined as energy released on addition of electron to an isolated gaseous atom.
The amount of energy released will be maximum when the tendency to attract electrons is maximum. As flourine has atomic number of 9 and has electronic configuration of 2,7. It can readily gain 1 electron to attain stable noble gas configuration and hence liberates maximum energy.
Answer:
0.39760273
Explanation:
I typed into calculator hope it's right.
Atoms return to their ground state by emitting a photon of light.