Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.
<h3><u>Answer;</u></h3>
(NH4)2S
<h3><u>Explanation;</u></h3>
- Ammonium sulphide, (NH4)2S, is an unstable compound, and in aqueous solution it exists as ammonia (NH4OH) and ammonium hydrosulphide, NH4HS.
- it is a highly water-soluble compound and produces the foul-smelling gas h2s when the solution is acidified.
- The anions; cl-, br-, i-, so42-, co32-, po43-, oh-, or s2- are not precipitated by (NH4)2S, but are precipitated by salts such as barium and silver nitrate.
Answer:
D.) molecule
<h3>When the same or different atoms combine together they for a molecule</h3>
Answer:
the petrochemical industry
Explanation:
"Petrochemicals are the chemical products obtained from petroleum by refining. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as maize, palm fruit or sugar cane." - Textbook excerpt
<span>Anions and cations attract one another by means of.. the forces of attraction that hold oppositely charged ions together in ionic compounds
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