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3 years ago

How many valence electrons does magnesium have

Chemistry

2 answers:

SashulF [63]3 years ago

7 0

Magnesium has just two valence electrons

Nastasia [14]3 years ago

7 0

Answer:

<em><u>2 Valence Electrons</u></em>

Explanation:

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Which reaction follows the laws of conservation of matter

leonid [27]

It's the law! Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants.

5 0

2 years ago

Iron and vanadium both have the BCC crystal structure and V forms a substitutional solid solution for concentrations up to appro

Hatshy [7]

Answer:

The unit cell edge length for the alloy is 0.288 nm

Explanation:

Given;

concentration of vanadium, Cv = 8 wt%

concentration of iron, Cfe = 92 wt%

density of vanadium = 6.11 g/cm³

density of iron = 7.86 g/cm³

atomic weight of vanadium, Av = 50.94 g/mol

atomic weight of iron, Afe= 55.85 g/mol

Step 1: determine the average density of the alloy

$\rho _{Avg.} = \frac{100}{\frac{C_v}{\rho _v} + \frac{C__{Fe}}{\rho _{Fe}} }$

$\rho _{Avg.} = \frac{100}{\frac{8}{6.11} + \frac{92}{7.86} } = 7.68 \ g/cm^3$

Step 2: determine the average atomic weight of the alloy

$A _{Avg.} = \frac{100}{\frac{C_v}{A _v} + \frac{C__{Fe}}{A _{Fe}} }$

$A _{Avg.} = \frac{100}{\frac{8}{50.94} + \frac{92}{55.85} } = 55.42 \ g/mole$

Step 3: determine unit cell volume

$V_c=\frac{nA_{avg.}}{\rho _{avg.} N_a}$

for a BCC crystal structure, there are 2 atoms per unit cell; n = 2

$V_c=\frac{2*55.42}{ 7.68*6.022*10^{23}} = 2.397*10^{-23} \ cm^3/cell$

Step 4: determine the unit cell edge length

Vc = a³

$a = V_c{^\frac{1}{3} }\\\\a = (2.397*10^{-23}}){^\frac{1}{3}}\\\\a = 2.88 *10^{-8} \ cm$ = 0.288 nm

Therefore, the unit cell edge length for the alloy is 0.288 nm

4 0

3 years ago

tensa zangetsu [6.8K]

Answer:

Argon is a noble gas

Hope this helps

5 0

2 years ago

What does a graduated cylinder use units of

Anni [7]

Explanation:

answer: uuuuh so sorry if i get wrong so basically they will practice measuring different liquids. They will use a container called a graduated cylinder to measure liquids. Graduated cylinders have numbers on the side that help you determine the volume. Volume is measured in units called liters or fractions of liters called milliliters (ml).

(defently not copy and pasted)

6 0

2 years ago

In science, what models are usually the best? A: Simple B: Complex C: Alphabetical D: Mathematical

Flura [38]

A) simple.

Hope this helped.

8 0

2 years ago

Read 2 more answers