My Two Birthday Elements

My first Element is Nitrogen.

Two physical properties:

1. Has a density of 1.25046 grams per liter.

2. It is a colorless, odorless, tasteless gas.

Two chemical properties:

1. It is a very inactive gas at room temperature.

2. It doesn't combine with many elements. Two elements it doesn't combine with are oxygen and hydrogen.

One use:

Nitrogen is used in containers that are air-tight to help preserve important documents.

My second element is Calcium.

Two physical properties:

1. It has a silvery-white metallic color.

2. It is a fairly soft metal.

Two chemical properties:

1. It has six isotopes.

2. It is flammable. When it is heated in the air or in oxygen it will ignite.

One use:

Calcium is used as a reducing agent in preparing other metals.

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