1. Reactivity: Group 1 metals, also known as alkali metals, are highly reactive. They readily lose their outermost electron to form a positive ion. This is due to the low ionization energy of these metals. Their reactivity increases down the group. For example, cesium is more reactive than lithium.

2. Softness: Alkali metals are soft and can be cut with a knife. This is due to the weak metallic bonding with only one electron in the outermost shell. The softness increases down the group. For instance, cesium is softer than lithium.

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1. Reactivity: Group 1 metals, also known as alkali metals, are highly reactive. They readily lose their outermost electron to form a positive ion. This is due to the low ionization energy of these metals. Their reactivity increases down the group. For example, cesium is more reactive than lithium.

2. Softness: Alkali metals are soft and can be cut with a knife. This is due to the weak metallic bonding with only one electron in the outermost shell. The softness increases down the group. For instance, cesium is softer than lithium.

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1. Reactivity: Group 1 metals, also known as alkali metals, are highly reactive. They readily lose their outermost electron to form a positive ion. This is due to the low ionization energy of these metals. Their reactivity increases down the group. For example, cesium is more reactive than lithium.

2. Softness: Alkali metals are soft and can be cut with a knife. This is due to the weak metallic bonding with only one electron in the outermost shell. The softness increases down the group. For instance, cesium is softer than lithium.

Choose two properties of the Group 1 metals:

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