Which element is radioactive, is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements. You can find this element in group 5A (15) directly to the right of the element that has 4 valence electrons in its 4th energy level.
Answers: 1
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All vaccination should(nāt) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence
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Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine
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Biology, 22.06.2019 07:30
Which locations on the map are low-pressure areas? a b c d e
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Which element is radioactive, is the rarest naturally occurring element in the Earth's crust, occurr...
Mathematics, 23.03.2020 22:28
Mathematics, 23.03.2020 22:28