2 years ago

About how many elements are found on the periodic table? Question 8 options:

Chemistry

1 answer:

krek1111 [17]2 years ago

3 0

the answer is actually 118 look it up

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Which of the following elements is the most electronegative?

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Chlorine is the most electronegative

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Express 450 x 10-9 m (wavelength of blue light) in decimal notation (i.e., express

Llana [10]

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0.00000045 m is the wavelength of blue light in decimal

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3 years ago

The gold foil experiment resulted in two major discoveries which were made about the structure of the atom. what were they

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It showed that the nucleus is positively charged, and that the atom isn't just made of electrons.

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What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n =

Lady bird [3.3K]

Answer:

$4.86\times10^{-7}\ \text{m}$

Explanation:

R = Rydberg constant = $1.09677583\times 10^7\ \text{m}^{-1}$

$n_1$ = Principal quantum number of an energy level = 2

$n_2$ = Principal quantum number of an energy level for the atomic electron transition = 4

Wavelength is given by the Rydberg formula

$\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}$

The wavelength of the light emitted is $4.86\times10^{-7}\ \text{m}$ .

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2 years ago

A container with two gases, helium and argon, is 30.0% helium. Calculate the partial pressure of helium and

iVinArrow [24]

Answer:

helium=1,2atm

argon=2,8atm

Explanation:

partial is pressure exerted by each gas in a system since 30% is helium it means 70% is argon

argon =70%x4

helium=30%4

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1 year ago