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Elenna [48]
3 years ago
7

Is dew forming on a leaf a physical or chemical change?

Chemistry
1 answer:
solong [7]3 years ago
5 0
No, the formation of dew is condensation, which is a physical change.
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Which of the following explains the process of radiation?
den301095 [7]

Answer:

When heat gets transferred through electromagnetic waves that move through space .

Explanation:

Radiation is the propagation of energy in the form of electromagnetic waves or subatomic particles through a vacuum or a material medium.

8 0
2 years ago
Roberto examines two molecular models. He sees that the atoms are the same in each model and are attached in the same order in e
almond37 [142]
Nao me denuncia eu so quero pontos
3 0
3 years ago
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How many core electrons are in a ground state atom of selenium?
Harman [31]
Electrons in an atom can be classified as core electrons and valence electrons. Valence electrons are those electrons which are present in valence shell and participates in bond formation. While, Core electrons are all remaining electrons which are not present in valence shell, hence not take part in bonding.

Atomic number of Selenium (Se) is 34 hence it has 34 electrons with following electronic configuration;

                          1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁴

From electronic configuration it is found that the valence shell is 4, and the number of electrons present in valence shell are 6. So, 

             Core Electrons  =  Total Electrons - Valence Electrons

             Core Electrons  =  34 - 6

             Core Electrons  =  28

Result:
          There are 28 core electrons in Selenium.
3 0
3 years ago
Which of the following is a radioisotope used to date rock formations older than 50,000 years old?
Natasha2012 [34]
I'm not so sure but I would say Answer Choice B
3 0
2 years ago
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What hypothesis led to the discovery of the proton?
Lana71 [14]

When a neutral hydrogen atom loses an electron, a positively-charged particle should remain.

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