3 years ago

Can you please answer questions regarding valence electrons?

Chemistry

1 answer:

Natasha2012 [34]3 years ago

4 0

Phosphorus has 5 valence
valence electrons is located to their group#
yes because of TAVE available valence electrons

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An element crystallizes in a face-centered cubic lattice. If the length of an edge of the unit cell is 0.408 nm, and the density

V125BC [204]

Answer:

Explanation:

For the density of a face-centered cubic:

$Density = \dfrac{4 \times M_w}{N_A \times a^3}$

where

$M_w$ = molar mass of the compound

$N_A=$ avogadro's constant

$a^3 =$ the volume of a unit cell

Given that:

Density $(\rho)$ = 19.30 g/cm³

a = 0.408 nm

a = $0.408 \times 10^{-9} \times 10^{2} \ cm$

a = $4.08 \times 10^ {-8} \ cm$

∴

$19.3 = \dfrac{4 \times M_w}{(6.023 \tmes 10^{23})\times (4.08 \times 10^{-8})^3}$

$M_w= \dfrac{19.3\times (6.023 \times 10^{23})\times (4.08 \times 10^{-8})^3}{4}$

$M_w=197.37 \ g/mol$

Thus, the molar mass of 197.37 g/mol element is Gold (Au).

4 0

2 years ago

Phosphorus that is stored in organisms

Mumz [18]

Explanation:

B. Recycles slowly

And it also depends on the organism

3 0

2 years ago

Which of the following best describes what happens when molecular compounds melt? A.) Molecules separate into their component at

Semenov [28]

I think the correct answer from the choices listed above is option D. When a molecular compound melts, they undergo the process of phase change from solid to liquid therefore m<span>olecules arranged in a regular pattern change to an irregular pattern. Hope this answers the question.</span>

3 0

3 years ago

If a penny (with the this volume .39 cm^3) was made out of pure copper, what should its mass be?

blondinia [14]

Answer:

3.49 g

Explanation:

The mass is the product of volume and density:

(8.96 g/cm³)(0.39 cm³) ≈ 3.49 g

The mass of a pure-copper penny would be 3.49 g.

5 0

2 years ago

Kyle is swinging at the playground. As he moves from the top of the swing to the bottom he will _____.

Mekhanik [1.2K]

Answer:

lose potential energy and gain kinetic energy

Explanation:

trust me thats the right answer i am not goo at explanations

8 0

2 years ago