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kotykmax [81]
3 years ago
10

Explain why the elements in group 7 have 7 valence electrons.

Chemistry
1 answer:
Citrus2011 [14]3 years ago
6 0

Answer:

The periodic table was made that way by the scientists who created it

Explanation:

to make things easier for the users.

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The isotopes of an element all have the same __(atomic, mass) __number, but they have different __(atomic,mass)__numbers.
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<h2>The isotopes of an element all have the same __(atomic, mass) __number, but they have different __(atomic,mass)__numbers.</h2>

Explanation:

The isotopes of an element all have the same __atomic  number  __, but they have different __mass __numbers.

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A piper delivers 9.98 g of water at 19 degrees Celsius. What does the pipet deliver
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Answer:

the volume = 9.99 ml

Explanation:

in your Q we need to calculate the volume does the pipet deliver so , we are going to use this formula:

the volume = mass / density

here we need to know the density of water at a certain temperature 19 degrees Celsius ,so I used an external source   to get the density of water at 19 degrees Celsius because it is changing with different temperatures

where mass here = 9.98 g

and  the density of water at  temperature 19 degrees Celsius=  0.998405mL

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by substitution :

the volume = 9.98 g / 0.998405mL

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5 0
3 years ago
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