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Romashka [77]
3 years ago
5

All elements are pure substances. True False

Chemistry
1 answer:
oee [108]3 years ago
5 0
It can be a compound or a single element. An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. There are about 117 elements, but carbon, hydrogen, nitrogen and oxygen are only a few that make up the largest portion of Earth.
hopefully that helps
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Explain how earth plates and lithosphere are related
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6 0
3 years ago
What is the electron configuration of neptunium?
UkoKoshka [18]
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3 0
3 years ago
A 50 gram sample of a radioisotope undergoes 2 half-lives. How many grams
Veseljchak [2.6K]

Answer:

At the end of second half life 12.5 g will left

Explanation:

Given data:

Total Mass = 50 g

Half lives = 2

Mass remain at the end = ?

Solution:

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So at the end of second half life 12.5 g will left.

3 0
3 years ago
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