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V125BC [204]
3 years ago
8

An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryll

ium. Which element is element X?
sodium (Na)
boron (B)
magnesium (Mg)
lithium (Li)
Chemistry
2 answers:
zavuch27 [327]3 years ago
5 0

Correct answer choice is :


A) sodium (Na)


Explanation:


It's a light element, reactive and with a low melting point, with a corresponding density of 0,97 at 20ºC. From the business point of view, sodium is the most significant of all the alkali elements. Sodium acts immediately with water, and also with snow and ice, to create sodium hydroxide and hydrogen.


Eddi Din [679]3 years ago
3 0
Sodium has three shells of electrons instead of two and has one electron in its valence shell. Beryllium has two in its valence shell.

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5 0
3 years ago
If you are given the molarity of a solution, what additional information would you need to find the weight/weight percent (w/w%)
Ludmilka [50]

Answer:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

Explanation:

Hello,

In this case, since molarity is mathematically defined as the moles of solute divided by the volume of solution and the weight/weight percent as the mass of solute divided by the mass of solution, we need:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

For instance, if a 1-M solution of HCl has a density of 1.125 g/mL, we can compute the w/w% as follows:

w/w\%=1\frac{molHCl}{L\ sln}*\frac{36.45gHCl}{1molHCl}*\frac{1L\ sln}{1000mL\ sln}*\frac{1mL\ sln}{1.125g\ sln}    *100\%\\\\w/w\%=3.15\%

Whereas the first factor corresponds to the molar mass of HCl, the second one the conversion from L to mL of solution and the third one the density to express in terms of grams of solution.

Regards.

4 0
3 years ago
Identify the property of the matter described below.
ZanzabumX [31]

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inn [45]
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Hope this helps let me know!</span>
8 0
3 years ago
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