Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity

The Periodic Table: chemical periodicity — practice question

Element $X$ belongs to Period 3. Element $X$ reacts with oxygen to form a solid, $Y$. If solid $Y$ is placed in water, it gives a solution with a pH of less than $7$. Which element is $X$?

Asodium
Bsilicon
Cphosphorus
Dsulfur

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