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Alex17521 [72]
3 years ago
6

What two elements do not need eight valence electrons to stay stable?

Chemistry
1 answer:
coldgirl [10]3 years ago
7 0
Hydrogen and helium because they only have one electron shell and it only holds up to two electrons in it.
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Wavelength (nm)n2E (J) 404.7 435.8 546.1 579.0 Show your work (or send in a separate sheet with your work on it): Q1: A sodium v
lora16 [44]

Answer: Please see answer below

Explanation:

Mecury vapor lamp is better to use than Sodium vapor light, this is because  because

---The Filaments of the lamp in sodium  emit fast moving electrons, which causes valence electrons of the sodium atoms to excite to higher energy levels which when electrons after being excited, relax by emitting yellow light which concentrates on the the  monochromatic bright yellow part of the visible spectrum which is about  580-590 or about (589nm) which will fall incident on the calibrations making it difficult to see

While

In Mercury vapor lamp, The emitted  electrons from the filaments, after having been excited  by high voltage, hit the mercury atoms but the excited electrons of mercury atoms relax and emits an  ultraviolet  uv invisible lights falling on the mecury vapour lamp to produce white light  covering  a wide range of  (380-780 nm) which is visible that is why it is used for calibrations purposes in  lightening applications.

7 0
3 years ago
2Na(s) + Cl2(g) ------ 2NaCl(s)
Dovator [93]

Answer:

1. 7.256g of NaCl

2. 47.33g of Cl2

Explanation:

2 moles of Na reacts to produce 2 moles of NaCl

8 moles of Na will still produce 8 moles of NaCl

Mass of NaCl = molar mass of Nacl/moles of Nacl

=58.5/8

=7.256g of NaCl

From the equation, 2 moles of Na reacts with 1 mole of Cl2

3/2 moles of Cl2 will react with 3 moles of Na

Mass of Cl2 = 71/1.5

=47.33g of Cl2

6 0
3 years ago
Pleaseeee helpppp thank youu​
Gemiola [76]

<em>Answer:</em>

<h3><em>Answer:</em><em> </em><em>well</em><em> </em><em> </em></h3>

<em>b. a type of gas is evolved ( hydrogen gas</em><em> )</em>

<em> </em>

5 0
2 years ago
How many hydrogen atoms are represented by the formula below?
Sonbull [250]

Answer:

c 9

Explanation:

4 0
3 years ago
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Explain how to use a graph to show whether or not the speed of an object is constant.
Sonbull [250]

Answer:

A horizontal line on a speed-time graph represents a constant speed. A sloping line on a speed-time graph represents an acceleration. The sloping line shows that the speed of the object is changing. The object is either speeding up or slowing down.

3 0
3 years ago
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