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Free_Kalibri [48]
3 years ago
12

Use the periodic table to give the name and symbol for each of the following elements:

Chemistry
1 answer:
Margarita [4]3 years ago
4 0

Explanation:

Noble gases are the gases which are present is group 18 of the periodic table.

(a) Sodium is the alkali metal that has 11 protons as its atomic number is 11. Sodium is present in group 1 and period 3 of the Periodic table. Therefore, noble gas present in period 3 is Argon.

(b) Argon is the noble gas that has 18 electrons and it is present in period 3. Hence, alkaline earth metal that is present in period 3 is magnesium.

(c) Manganese is the element that has atomic number (or protons) equal to 25 and its atomic mass (total protons + total neutrons) equal to 55. Manganese is present in period 4 and noble that is also present in period 4 is krypton.

(d) Gold is the element that is present in period 6. And, a noble gas which is also present in period 6 is Radon.

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stellarik [79]
  B A C ( Blood Alcohol Content ) of 0.10 means that there are 0.10 g of alcohol for every  dl  of blood.
  5 L = 50 dl
  50 * 0.10 g = 5 g
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mojhsa [17]

Answer:

The answer to your question is the letter B

Explanation:

I will draw the skeletal structures of these compounds to determine which alcohol is secondary.

Secondary alcohol is alcohol in which the hydroxyl group is attached to a secondary alcohol.

Letter A has primary and secondary alcohol so I discard this choice.

Letter B has secondary alcohol, so this is the correct choice.

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Consider the nuclear equation below. 222/66Rn-->218/?Po+4/2He Which is the missing value that will balance the equation? 84 8
erastovalidia [21]
<h3>Answer:</h3>

84

<h3>Explanation:</h3>
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  • Therefore, the complete nuclear equation is;

²²²₈₆Rn → ²¹⁸₈₄Po + ⁴₂He

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emmainna [20.7K]

Answer:

False

Explanation:

youre welcome

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