A Halogen is a group (or a column) on the periodic table. It contains fluorine, chlorine, bromine, and astatine!
Chromium sulfate.
Cr is chromium, and SO4 is sulfate.
Answer:
There's no passage but I can say that matter are that ''thing'' which extend through all Universe, matter is everything. It can be seen or felt as liquid, gas or solid. This changes of its state depend on the amount of energy that is involved.
So, here is used categorical thinking because is a abstract concept that is hard to understand sometimes. It's abstract when we say that matter is all, not just what we see, but even what we don't see like ''Dark Matter'', which is the majority in the Universe.
Answer:
It only needs one electron.
