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mr_godi [17]
4 years ago
9

What is name of first man made element?

Chemistry
1 answer:
Aleonysh [2.5K]4 years ago
4 0
The first man-made element or artificial element which is produced because it is not found naturally in nature is Technicium, in 1937. Technicium has an atomic number of 43 and atomic mass of 98 g/mol.
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How many protons neutrons and electrons are there in a neutral atom of 43k (potassium-43)?
Veronika [31]

Answer:

             Number of Protons  =  19

             Number of Neutrons  =  25

             Number of Electrons  =  19

Explanation:

Number of Protons:

                               The number of protons present in any atom are equal to the atomic number of that particular atom. Hence, as the atomic number of Potassium is 19 therefore, it contains 19 protons.

Number Neutrons:

                             The number of neutrons present in atom are calculated as,

                               # of Neutrons  =  Atomic Mass - # of protons

As given,

                                Atomic Mass  =  43

                                # of Protons  =  19

So,

                                # of Neutrons  =  43 - 19

                                # of Neutrons  =  24

Number of Electrons:

                                   As we know for a neutral atom the number of electrons are exactly equal to the number of protons present in its nucleus. So, for 19 protons in neutral Potassium atom there must be 19 electrons.

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Which of these best describes the relationship between density and the rate of heat transfer?
Nikitich [7]

Answer: the answer is a i suppose

Explanation:

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What did theodor schwann do??? for the cell theory (what is the theory)
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6 0
4 years ago
Can someone plz help me on question 3 I really need help plz
zavuch27 [327]

1. <em>Describe</em>

Frequency (f) and wavelength (λ) are inversely related.

f ∝ 1/λ

As one goes up, the other goes down and vice versa.

2. <em>Infer </em>

The frequency of infrared light is less than that of red light, so infra could mean something like less than or below or beneath.

Ultrahigh frequencies are extremely high compared with those of visible light. Ultrasound has frequencies that are far beyond what we can hear. An ultracentrifuge goes at extremely high speed, and an ultramicroscope can “see” tiny structures. Ultra could probably mean something like extremely or far beyond.

3. <em>Analyze </em>

Energy is directly proportional to frequency (E ∝ f).

Frequency is inversely proportional to wavelength (f ∝ 1/λ).

Energy is inversely proportional to wavelength (E ∝ 1/λ).

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