A) Using the following elements complete the table below: Step 1: Identify the Group I element from the given list (Sodium, Na, Calcium, Ca, Magnesium, Mg). Sodium (Na) is in Group I. Step 2: Recall t

Sodium (Na) is in Group I.

They are known as Alkali metals.

b) Give one physical property of the group 1 metals.

Group 1 metals are known for being soft enough to be cut with a knife.

b) One physical property is that they are $\boxed{\text{soft (can be cut with a knife)}}$.

c) Give one chemical property of the elements of group 1.

Group 1 elements are highly reactive and readily lose their single valence electron.

c) One chemical property is that they are $\boxed{\text{highly reactive (react vigorously with water)}}$.

d) Write equations to show how these elements behave in water.

• Na: Sodium reacts vigorously with cold water to produce sodium hydroxide and hydrogen gas.

  $$\boxed{2\text{Na(s)} + 2\text{H}_2\text{O(l)} \rightarrow 2\text{NaOH(aq)} + \text{H}_2\text{(g)}}$$

• Mg: Magnesium reacts slowly with cold water to produce magnesium hydroxide and hydrogen gas.

  $$\boxed{\text{Mg(s)} + 2\text{H}_2\text{O(l)} \rightarrow \text{Mg(OH)}_2\text{(s)} + \text{H}_2\text{(g)}}$$