<span>Answer:
K because it is metal and typically forms ionic bonds. Ar is also unlikely to form any bonds because it has a full outer shell of electrons, but it can form covalent bonds.</span>
The air in the sky and the clouds are gas, however some things in the sky [such as the sun/moon] are solid.
Hope that helped!
Answer:
the mass number of the atom or ion is 6
<u>Buffers</u> function by absorbing excess hydrogen or hydroxide ions.