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In the ground state, each atom of an element has two valence electrons. This element has a lower first ionization energy than calcium. Where is this element located on the Periodic Table?
It is a period or row that is energy level five or more, below calcium on . Two valence electrons places the element in the alkaline earth family or...
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The work function of an element is the energy required to remove
an electron from the surface of the solid element. The
work function for lithium is 279.7 kJ/mol. What is the maximum
wavelength of light that can remove an electron from an
atom ?
The maximum of light that can remove an electron from a lithium atom is equal to $4.279 * 10^(-7)"m"$. So, you know that the work function of lithium, which is...
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What is the electron configuration for an excited atom of phosphorous, ready to emit a photon of energy and return to ground state? (configuration has to follow all rules except be in lowest energy)
Phosphorus has $15$. As such its electronic configuration in ground state is $1s^2 2s^2 2p^6 3s^2 3p^3$ The following electronic configurations could be excited states $1s^2 2s^2...
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A mercury atom in the ground state absorbs 20.00 electronvolts energy and is ionized by losing an electron. How much energy does this electron have after the ionization?
The kinetic energy $("KE")$ of a particle is equal to the difference between its absorbed energy $("AE")$ and its ionization energy $("IE")$. The first ionization energy of $"Hg"$ is $"10.4375...
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An element with an electron configuration of $1s^2 2s^2 2p^6 3s^1$ will have properties most similar to which element?
Given: $1s^2 2s^2 2p^6 3s^1$ can generally be used to find the electron configuration of an element. There are a few special cases: 1st column, hydrogen + alkali metals:...
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Consider the element with the electron configuration $[Kr]5s^2 4d^7$. What is this element?
All I have done here is to use $"the Periodic Table"$, a copy of which you will always have available in every exam in chemistry and physics you will ever...
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When a sodium atom reacts with a chlorine atom to form a compound, the electron configuration of the ions forming the compound are the same as those in which noble gases?
$Z=11, "sodium"$; the nearest Noble Gas on the Table has $Z=10$. So when sodium is oxidized it should have an equal number of electrons to .......? On the other hand,...
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When a sodium atom reacts with a chlorine atom to form a compound, the electron configuration the ions forming the compound are the same as those in which noble gases?
The of metals tend to be lost, and for this reason metals TEND to be reducing. And non-metals are electron poor. And as a result they tend to be oxidizing....
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Which option contains a $2*g$ mass of sodium atoms....
$1.$ $5.24xx10^22*"sodium atoms?"$
$2.$ $6.022xx10^24*"sodium atoms?"$
$3.$ $3.12xx10^23*"sodium atoms?"$
$4.$ $5.24xx10^22*"sodium atoms?"$
We know that $1*mol$ contains $6.022xx10^23$ individual sodium atoms, and has a mass of $22.99*g$. And thus for $1.$ there is a $2*g$ mass of $Na$. For $2.$ there is...
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A compound is broken down into 34.5 g of element A, 18.2 g of element B, and 2.6 g of element C. What is the percent (by mass) of each element?
$%A$ $=$ $(34.5*g)/(34.5*g+18.2*g+2.6*g)xx100%=62.3%$ $%B$ $=$ $(18.2*g)/(34.5*g+18.2*g+2.6*g)xx100%=33.0%$ $%C$ $=$ $(2.6*g)/(34.5*g+18.2*g+2.6*g)xx100%=4.70%$ That is $%" element"$ $=$ $"Mass of element"/"Mass of compound"xx100%$ $"Mass of compound"$ is clearly the SUM of the constituent ....
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