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The Noble Gases. Helium is less dense than air, so it's great for all kinds of balloons. Helium balloons lift instruments into the upper atmosphere to. - ppt download
![Select the correct answer. Identify the region in the image where lighter elements such as hydrogen - Brainly.com Select the correct answer. Identify the region in the image where lighter elements such as hydrogen - Brainly.com](https://us-static.z-dn.net/files/dd3/de7d7372dd83838e8a2a98d81c88394a.png)
Select the correct answer. Identify the region in the image where lighter elements such as hydrogen - Brainly.com
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