Valency is the number of electrons lost or gained by an atom to attain an stable configuration. Valency is important when writing the formula of chemical compounds in chemistry. Strontium has a valency of 2 while sulfite ion (radicle) has a valency of 2. Therefore, the chemical formula of strontium sulfite is written as SrSO3.
B)a force pushed the rock layers after they were formed
Answer:
Streak is tested by scraping a mineral across plate
Explanation: Hope this helps :)
