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fredd [130]
3 years ago
8

Type the correct answer in each box. In an atom, the first energy level can hold electrons. The second energy level can hold ele

ctrons. The third energy level can hold electrons.
Chemistry
1 answer:
Elis [28]3 years ago
4 0
I might be wrong but I think its 2 then 4 then 8
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The half-life of carbon-14 is 5,730 years. How many grams of parent material will remain from a 200-gram sample after 3 half-liv
Alex17521 [72]

Answer:

The answer to your question is 25 grams

Explanation:

Data

half-life = 5730 years

sample = 200 g

after 3 half-lives

Process

Calculate the amount of sample after one, two and three half-lives.

After each half-life, that of sample is half the previous amount.

                         Number of half-lives           Amount of sample

                                       0                                        200 g

                                        1                                         100 g

                                        2                                          50 g

                                       3                                           25 g

4 0
3 years ago
4. What is a homogeneous solution? Give an example.
Gennadij [26K]

Answer:

Homogeneous solutions are solutions with uniform composition and properties throughout the solution.

Explanation:

For example a cup of coffee, perfume, cough syrup, a solution of salt or sugar in water, etc. Heterogeneous solutions are solutions with non-uniform composition and properties throughout the solution.

8 0
2 years ago
Read 2 more answers
How many resonance structures can be drawn for N2O5 (no N-N bond) (minimal formal charge)?
Nezavi [6.7K]
There are approximately 4 resonance structures that can be drawn for N205 (no N-N bond) (minimal formal charge). 
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2 years ago
How spectral lines are formed
Ket [755]

=Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…

3 0
2 years ago
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What is the name of the compound made from Sn 4+ and PO4 3-?
givi [52]

Answer:

Sn₃(PO₄)₄ - tin(IV) phosphate.

Explanation:

Hope it helps! :)

8 0
3 years ago
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