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xenn [34]
3 years ago
9

12. Which element is a metalloid? 1) AI 2) Ar 3) As 4) Au

Chemistry
1 answer:
Nina [5.8K]3 years ago
4 0
I believe it is element As, for arsenic.
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An atom that contains 22 protons,
Westkost [7]

Answer: 45

Explanation:

Recall that mass number = number of protons + number of neutrons. Hence, the mass number of the atom

= 22 + 23

= 45

Furthermore, the atomic number is equal to the number of protons. Hence, since the number of protons is 22. the atom has an atomic number of 22

Thus, An atom that contains 22 protons,

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6 0
3 years ago
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Consider the addition of HBr to 2-pentene. Indicate the re
lana [24]

Answer:

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This is called
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umka21 [38]

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2 years ago
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