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Sunny_sXe [5.5K]
3 years ago
10

Briefly explain Potassium with 19 protons and 19 neutrons

Chemistry
1 answer:
Igoryamba3 years ago
8 0

Answer: Group  

1  

Melting point  

63.5°C, 146.3°F, 336.7 K  

Period  

4  

Boiling point  

759°C, 1398°F, 1032 K  

Block  

s  

Density (g cm−3)  

0.89  

Atomic number  

19  

Relative atomic mass  

39.098    

State at 20°C  

Solid  

Key isotopes  

39K  

Electron configuration  

[Ar] 4s1  

CAS number  

7440-09-7  

Explanation:

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Lithium, beryllium, and boron are elements with atomic number 3, 4, and 5, respectively. Even though they are three of the five
Papessa [141]

Explanation:

These elements are rare because:

<u>Helium fuses into the carbon by the combination of three helium nuclei (Z = 2) and one carbon nucleus (Z = 6), therefore bypassing elements with Z= 3, 4 and 5 which are  lithium, beryllium, and boron respectively. Therefore, the fusion processes in cores of the stars do not form these three elements. </u>

7 0
3 years ago
Which element has Atoms with the strongest association for electrons in A chemical bond
Marat540 [252]

The most electronegative element will have atoms with strongest association for electrons. Electronegativity is the ability of an atom to attract electrons and form bonds with electrons. . In the periodic table the left hand side favors the loss of electrons because less energy is required to lose an electron than to gain an electron. On the other han, the right hand side favors gaining electrons since less energy is required than when losing electrons.

Henceforth, from left to right in the periodic table the tendency to gain electrons increases. In contrast, going down a group there is decreased association for electrons, because atomic radius increases which suggests that valence electrons are further away from the nucleus.This makes fluoride the ion with strongest association of electrons. The noble gases have a complete shell so cannot attract electrons to themselves, which means they have no electronegativity.

6 0
3 years ago
Iron-59 has a half-life of 44 days. a radioactive sample has an activity of 0.64 mbq. what is the activity of the sample after 8
myrzilka [38]
Radioactive decay is a pseudo-first order reaction. When you know the half-life of the material, you could use this equation.

A= A₀(1/2)^t/h
where 
A is the final activity
A₀ is the initial activity
t is the time
h is the half-life

A = (0.64)(1/2)^88/44 = <em>0.16 mbq</em>
6 0
3 years ago
2b. 12 grams of C8H18 react with oxygen to produce carbon dioxide and water. How many grams of CO2 are produced?
likoan [24]

Answer:

37.1g are produced

Explanation:

The combustion of C₈H₁₈ is:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O

<em>Where 1 mole of C₈H₁₈ produce 8 moles of CO₂</em>

<em />

To find the mass of CO₂ that is produced we need to convert the mass of C₈H₁₈ with molar mass. Then, with the chemical equation, we can find the moles of CO₂ and its mass, as follows:

<em>Moles C₈H₁₈ -Molar mass: 114.2g/mol-</em>

12g C₈H₁₈ * (1mol / 114.2g) = 0.105 moles of C₈H₁₈

<em>Moles CO₂:</em>

As 1 mole of C₈H₁₈ produce 8 moles of CO₂, 0.105 moles of C₈H₁₈ produce:

0.105 moles of C₈H₁₈ * (8moles CO₂ / 1mole C₈H₁₈) = 0.84 moles of CO₂

<em>Mass CO₂ -Molar mass: 44.01g/mol-:</em>

0.84 moles of CO₂ * (44.01g / mol) = 37.0g of CO₂ ≈

<h3>37.1g are produced</h3>
4 0
2 years ago
A cell is a system of parts that work together to carry out basic life processes. An animal is also a system of parts that work
blagie [28]
Nucleus is like the brain of the cell
Cell wall would be the skin
Cell membrane is the skeletal system
Mitochondria is the digestive system
I hope I’m right
4 0
3 years ago
Read 2 more answers
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