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| Considering what you know about the Earth's early atmosphere was there a protective layer of ozone around the earth 4.0 billion years ago? |
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| What are the two most abundant elements in the sun and universe? |
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| Silicon (Si) has an atomic number of 14, how many electrons does it have in its outermost/3rd shell? |
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| 4 (try to figure this out?) |
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| The ozone layer protects the Earth from: |
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| In electrically neutral atoms, which subatomic particles are always equal in number? |
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| What is formed when an atom loses or gains a proton? |
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| Isotopes of the same element differ in the number of? |
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