noellelovebug1214
26.06.2019 •
Chemistry
Create a rule about how many valence electrons an atom will have
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Ответ:
Most of the elements have their 8 electrons in its outermost shell this shell is called valence shell.
The most of elements containg 8 electrons to their valence shell are mostly stable in nature and rule obey octet rule the is 3n subshell surrounds 18 electrons.
e. g Nobel gases shows octet rules.
Ответ:
Sodium iodide NaI
Magnesium chloride MgCl₂
Explanation:
Silicon dioxide SiO₂ it is not soluble in water, so it can not be recrystallized from water, it is a white solid and the boiling point is 2230 °C. This one is not the unknown solid.
Sodium iodide NaI it is soluble in water, it has a white color and the boiling point is 1304 °C . This can be the unknown solid.
Magnesium chloride MgCl₂ is soluble in water, it have a white color and the boiling point is 1,412 °C . This can be the unknown solid.
Phosphorus tribromide PBr₃ is will start a hydrolysis reaction in water, it is a colorless liquid and it has a boiling point of 173 °C. This one is not the unknown solid.