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3 years ago

Which atom in the ground state has a partially filled second electron shell?

Chemistry

2 answers:

adell [148]3 years ago

7 0

The answer is lithium.

This is because it has an electron configuration of 1s2, 2s1 (also written as [He]2s1)

serious [3.7K]3 years ago

4 0

Atoms have electrons filled in energy shells.
1. H - hydrogen atom has one electron in the First energy shell. Therefore hydrogen has a partially filled first energy shell

2.Li - Li electron configuration is 2,1
The outermost energy shell is the second energy shell in which there is only one electron
Therefore the second energy shell is partially filled. This is the correct answer

3. K - electron configuration is 2,8,8,1
The outermost energy shell is the fourth energy shell which is partially filled. The second energy shell is completely filled

4.Na - electron configuration is 2,8,1
The outermost energy shell is the third energy shell which is partially filled
Second energy shell is completely filled

From the given options Li is the only element with a partially filled second energy shell
Answer is Li

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How many valence electrons does lithium (Li) have available for bonding?

Marina CMI [18]

Lithium has 1 valence electron available for bonding. So its A.

6 0

3 years ago

Read 2 more answers

(b) Once the ionic solid has dissolved, the anion that is formed is able to react as a base, with water as the acid. Write the n

Marrrta [24]

Answer:

b C₂H₃O₂⁻ + H₂O ⇄ HC₂H₃O₂ + OH⁻

e HC₂H₃O₂ + H₂O ⇄ H₃O⁺ + C₂H₃O₂⁻

f ka<<1

g. Weak acid molecules and water molecules

Explanation:

The water molecule could act as a base and as an acid, a molecule that have this property is called as amphoteric.

b The salt NaC₂H₃O₂ is dissolved in water as Na⁺ and C₂H₃O₂⁻. The reaction of the anion with water is:

C₂H₃O₂⁻ + H₂O ⇄ HC₂H₃O₂ + OH⁻

Where the C₂H₃O₂⁻ is the base and water is the acid.

e. The reaction of HC₂H₃O₂ (acid) with water (base), produce:

HC₂H₃O₂ + H₂O ⇄ H₃O⁺ + C₂H₃O₂⁻

f. As the acetic acid (HC₂H₃O₂) is a week acid, the dissociation in C₂H₃O₂⁻ is not complete, that means that ka<<1

g. The ka for this reaction is 1,8x10⁻⁵, that means that there are more weak acid molecules (HC₂H₃O₂) than conjugate base ions. Also, the water molecules will be in higher proportion than hydronium ions.

I hope it helps!

4 0

2 years ago

An Isolated system could be best described as a _______________.

trasher [3.6K]

Hello Mate!

Well, there are many definitions and descriptions of isolated systems, and here are some of them:

1. It can be a physical system which is located very very far from all other systems, so there is absolutely no interaction between them, thus making it isolated.

2. It can be a thermodynamic system with rigid walls, which prevents mass and energy to pass through.

I Hope my answer has come to your Help. Thank you for posting your question here in $Brainly.$ We hope to answer more of your questions and inquiries soon. Have a nice day ahead! :)

$(Ps. Mark As Brainliest IF Helped!)$

$-TheOneAboveAll :D$

7 0

3 years ago

What is the potential energy of 4kg object sitting on a 3m ledge?

bagirrra123 [75]

Potential energy (Pe) = m*g*h

m = 4 kg
g = 10 m/s²
h = 3 m

And now:

Pe = 4*10*3

Pe = 120 Joules ou J

6 0

3 years ago

Common body-centered cubic (bcc) metals do NOT Include

Lelechka [254]

Answer:

Titanium

Explanation:

BCC i.e. body-centered cubic is a type of non-primitive unit cell.

In bcc type crystal structure the atoms are arranged in the corners of the unit cell and also on the center of the body of that unit cell.

Among the given options Titanium is the only metal which does not form bcc type crystal structure.

Titanium forms hcp (hexagonal close packing ) type of crystal structure.

The coordination number of hcp is 12 and it is ABAB type lattice.

8 0

3 years ago