Write the formula for the following for the hydroxide of a metal X having 19 protons.
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Answer:
Correct option is
A
X
2
O
Element X with atomic number 19 will lose one electron to form X
+
with 18 electrons corresponding to the stable noble gas electronic configuration.
Oxygen gains two electrons to form O
2−
ion. One O
2−
ion combines with two X
+
ions to form X
2
O.
Note: In a neutral molecule, the total charge on cations is numerically equal to total charge on anions.
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