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3 years ago

An atom of fluorine has an atomic number of 9 and an atomic mass of 19. The atom contains

1 answer:

muminat3 years ago

8 0

The number of neutrons is the difference between the mass number and the number of protons.

You get the element by looking at the atomic number which is the number of protons. In this case, it is 9 and yes, it is F.

However it is not an atom because it has 10 electrons so you have a fluoride ion F-. 

The number of neutrons = 19 - 9 = 10

Therefore, the answer is D.

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!

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VARVARA [1.3K]

Answer:

I think the answer is A

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3 years ago

Two protons and two neutrons are released as a result of this reaction.

Murljashka [212]

Answer: The particle released in the given reaction is one alpha particle

Explanation:

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

$^{222}_{86}\textrm{Rn}\rightarrow ^A_Z\textrm{X}+^{218}_{84}\textrm{Po}$

To calculate A:

Total mass on reactant side = total mass on product side

222 = A + 218

A = 4

To calculate Z:

Total atomic number on reactant side = total atomic number on product side

86 = Z + 84

Z = 2

The isotopic symbol of unknown element is $_{2}^{4}\textrm{He}$ . Another name of helium atom is alpha particle.

Hence, the particle released in the given reaction is one alpha particle

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3 years ago

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A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 °C to 200 °C. What is the mass of the pie

irakobra [83]

Answer:

B.) 129.9 grams

Explanation:

To find the mass, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy (J)

-----> m = mass (g)

-----> c = specific heat (J/g°C)

-----> ΔT = change in temperature (°C)

The specific heat of copper is 0.385 J/g°C. Knowing this, you can plug the given values into the equation and simplify to isolate "m".

Q = mcΔT <----- Equation

5000 J = m(0.385 J/g°C)(200 °C - 100 °C) <----- Insert values

5000 J = m(0.385 J/g°C)(100) <----- Subtract

5000 J = m(38.5) <----- Multiply 0.385 and 100

129.9 = m <----- Divide both sides by 38.5

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1 year ago

Calculate the approximate volume of a 0.500 mol sample of gas at 15°C and a pressure of 1.10 atm.

Marianna [84]

T=15+273=298k
P=1.1atm
n=0.5mol

Apply ideal gas equation

PV=nRT
V=nRT/P
V=0.5(8.314)(298)/1.1
V=1126.16mL
V=1.12L

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2 years ago

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What is the types of kinetic eneygy

vladimir2022 [97]

Kinetic energy can be expressed in heat, motion, light, and sound.

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3 years ago

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