A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
Answers
Final answer:
The element with 11 protons, 11 electrons, and 12 neutrons is an Isotope of Sodium, specifically Sodium-23. The atomic number, determined by the number of protons, identifies the element.
Explanation:
The element described here, with 11 protons, 11 electrons, and 12 neutrons, is Sodium. The number of protons in an atom defines the atomic number, and thus identifies the element. In this case, the atomic number is 11, which corresponds to Sodium on the periodic table. Neutrons contribute to the mass number, but not the identity of the element. Therefore, an element with 11 protons and 12 neutrons is an isotope of Sodium. Sodium normally has 11 neutrons, but in this case, it has 12, which makes it an isotope of Sodium commonly referred to as Sodium-23.
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Related Questions
Which types of reactions would result in the formation of precipitate?
As a chemical reaction occurs, the thermometer in the container records an increase in temperature. What is true of the reaction? The reaction is endothermic because heat was taken in by the reaction. The reaction is exothermic because heat was released by the reaction. The reaction is endothermic because heat was released by the reaction. The reaction is exothermic because heat was taken in by the reaction.
A force of 1 700 N is applied to a 1 300 kg car. what is the magnitude of acceleration of the car?
calculate the volume of hydrogen produced at s.t.p when 25g and zinc are added to excess dilute hydrochloric acid at 31 degrees and 778 mm Hg pressure ( H= 1 , Zn = 65 , cl = 35.5 , volume of gas at stop = 22.4 dm cube
Answers
Answer:
The reaction rate will be multiplied by four.
Explanation:
The reaction rate is the measure of how fast a reaction is happening, and it can be calculated by how fast the reactants are disappearing, or how fast the products are being formed.
For a generic reaction:
A → B + C
The rate (r) is:
-r = k*[A]ⁿ
The minus signal refers to the disappearing of the reactant, k is the velocity constant of the reaction, and n is the reaction order. So, for a second-order reaction:
-r = k*[A]²
If the concentration of A is doubled: [A]' = 2[A]
-r' = k*(2[A])²
-r' = k*4*[A]
-r' = 4*k*[A]
-r' = 4*(-r)
Answers
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, waves from lowest frequency to highest frequency are radio waves, infrared rays, ultraviolet rays and gamma rays.
What is electromagnetic wave?
Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
Waves from lowest frequency to highest frequency are radio waves, infrared rays, ultraviolet rays and gamma rays.
Therefore, waves from lowest frequency to highest frequency are radio waves, infrared rays, ultraviolet rays and gamma rays.
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(2) 59.3 s (4) 118 s
Answers
1 gram remain out of 16 grams after 237 seconds.
So,
1g -> 2g -> 4g -> 8g -> 16g
So, 4 half lives have taken palce.
So,
we divide 237 by 4 and we get our answer.
So,
234 / 4 = 59.25 ≈ 59.3
So, the answer is (2) 59.3 seconds
Final answer:
The half-life of sodium-25, when 1.00 gram of a 16.00-gram sample remains unchanged after 237 seconds, is approximately 59.3 seconds. This solution was found by calculating the number of times the sample halved and dividing the total time by this figure.
Explanation:
The question asks for the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample remains unchanged after 237 seconds. In nuclear physics and nuclear chemistry, the half-life is the amount of time it takes for half of a sample of a radioactive substance to undergo decay.
Given that sodium-25 has gone from 16 grams to 1 gram, we can see that 1/16th of the original amount is left after 237 seconds. In other words, the quantity of sodium-25 has halved approximately 4 times. Therefore, the half-life will be the total time divided by the number of half-lives.
By dividing 237 seconds by 4, we get 59.25 seconds. So, the closest accurate answer is (2) 59.3s.
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Answers
Answers
When looking up at the clouds, you can usually make out different shapes and figures with cumulus clouds.
Cumulus low-level clouds. They are the puffy, white, cotton-top clouds that look so soft.
Answers
Answer:
C.
Explanation:
Molecules with the stronger intermolecular forces are pulled tightly together to form solid at higher temperatures and that's why the freezing point is higher.
Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.
Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).
Thus, the compound which is gas at room temperature is because it has least number of carbon atoms and absence of hydrogen bonding.
Final answer:
Among the choices, only CH3CH2CH3 (propane) is a gas at room temperature. The other compounds, CH3CH2OH (ethanol), CH3CH2CH2CH2CH2CH2CH3 (hexane), and HOCH2CH2OH (ethylene glycol) are all liquids.
Explanation:
Among the four compounds given, compound C, which is CH3CH2CH3 (also known as propane), is a gas at room temperature. Compound A (CH3CH2OH, or ethanol), compound B (CH3CH2CH2CH2CH2CH2CH3, or hexane), and compound D (HOCH2CH2OH, or ethylene glycol) are all liquids at room temperature.
The state of a compound at room temperature depends on factors like molecular mass and intermolecular forces. Propane has a smaller molecular mass and weaker intermolecular forces than the others, making it a gas at room temperature.
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