CHEM Q(中+英回答)

1. 同一族原素有相似的化學性質：

同一族的鉀、鈉與鹵素反應時相似：
2K+ X2 --> 2KX

2Na+ X2 --> 2NaX

2. 鉀、鈉與水反應時十分劇烈，產生熱、氫氣及金屬氫氧化鈉：
2K + 2H2O --> 2KOH + H2

2Na + 2H20 --> 2NaOH + H2

但鉀與水的反應比鈉的更加劇烈，產生的熱更多、產生氫氣的初速較高。

同一族的原素有相似化學特性；
於第一族，活性由上至下遞增。

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1. Two elements have similar reactions, if they are in the same group.

Potassium & Sodium (In same group) have same reactions when they react
with halogens.

2K+ X2 --> 2KX

2Na+ X2 --> 2NaX

2. It is very exciting when K & Na react with water and produce heat,
hydrogen and metal hydroxide：

2K + 2H2O --> 2KOH + H2

2Na + 2H20 --> 2NaOH + H2

However, the reaction of potassium with water is more exciting than sodium's.
It proudces more heart and the initial velocity of hydrogen producing is faster.

Two elements have similar reactions, if they are in the same group.
In Group I, the activity raises from the top to the bottom.

sodium and potassium are silvery solid , they are reactive , have similar chemical properties (Reaction with water ), they can conduct electricity, by compare the reaction with water among them, potassium has a more faster and has lilac flame but sodium only has a slower and small or no flame reaction.