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MA_775_DIABLO [31]
3 years ago
8

Whats the name?!?!?!??!?!?!?!?!?!?!!?!?!?!??!?!?!?!

Chemistry
1 answer:
SIZIF [17.4K]3 years ago
7 0
Hydrogen i suppose is the right one
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Determine the total time that must elapse until only ¼ of an original sample of the radioisotope Rn-222 remains unchanged.
Arte-miy333 [17]

Answer:

7.6 days

Explanation:

Radon is a radioactive element and Radon-222 is it's most stable isotope. The half-life of Radon-222 has been found to be approximately 3.8 days.

Let, the initial amount of the Rn-222 = 1 = A

Final amount = \frac{1}{4} = A'

We will use the following relation for calculating time elapsed in the decay

A' = A(\frac{1}{2} )^\frac{t}{t_1_/_2}  }

Thus,

\frac{1}{4} =1(\frac{1}{2} )^\frac{t}{3.8}

We can write is as,

(\frac{1}{2} )^2=(\frac{1}{2} )^\frac{t}{3.8}

Since the base in both sides are equal, powers can also be equal and thus,

2=\frac{t}{3.8}

So, t = 7.6 days

5 0
3 years ago
The local weather station is predicting that a warm front will pass through Charlotte, NC in two days.
Nutka1998 [239]

Answer:

C the temperature will increase.

4 0
3 years ago
Which statement describes heterogeneous mixtures?
artcher [175]
<span>Heterogenous mixtures are those which are seperable by physical means. These mixtures do not have uniform properties throughout the substance. For example, blood is a heterogenous mixture because it can be seperated into its components via a physical change (centrifugation). </span>
5 0
3 years ago
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How many orbitals are completely filled in an atom that has 12 electrons?
Irina-Kira [14]
There are 2 full orbitals and 2 electrons left over.
4 0
3 years ago
Which of the following is NOT a type of nuclear decay? *<br> Alpha<br> Beta<br> Gamma<br> Delta
wolverine [178]

Answer:

Delta

Explanation:

Delta is a not a type of nuclear decay. Most times, the delta sign is used to denote a change between the initial and final states of a reaction.

There are three main types of nuclear decay which are:

  • Alpha decay
  • Beta decay
  • Gamma decay
  1. Alpha decay results in the formation of alpha particles.
  2. Beta decay produces electron like particles.
  3. Gamma decay produces gamma radiations.
8 0
3 years ago
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