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One way to estimate the effective charge $\left(Z_{\text {eff }}\right)$ of a many-electron atom is to use the equation $I E_{1}=$ $(1312 \mathrm{kJ} / \mathrm{mol})\left(Z_{\mathrm{eff}}^{2} / n^{2}\right),$ where $I E_{1}$ is the first ioniza-tion energy and $n$ is the principal quantum number of the shell in which the electron resides. Use this equation to calculate the effective charges of Li, $\mathrm{Na}$, and K. Also calculate $Z_{\text {eff }} / n$ for each metal. Comment on your results.

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$$\begin{aligned}&\begin{array}{|c|c|}\hline \mathrm{Li} & 1.26 \\\mathrm{Na} & 1.844 \\\mathrm{K} & 2.26 \\\hline\end{array}\\&Z_{\mathrm{eff}}:\\&\frac{Z_{\text {eff }}}{n}:\\&\begin{array}{|c|c|}\hline \mathrm{Li} & 0.63 \\\mathrm{Na} & 0.614 \\\mathrm{K} & 0.565 \\\hline\end{array}\end{aligned}$$

Chemistry 101

Chapter 8

Periodic Relationships Among the Elements

Periodic Table properties

Carleton College

University of Central Florida

Rice University

Lectures

03:33

In chemistry and physics, a periodic table or periodic chart is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configurations, and recurring chemical properties. Elements are presented in order of increasing atomic number ("column") and periodic properties, such as symbol, name, atomic mass and group (period) number are listed for each element. The periodic table can be used to derive relationships between the various properties of the elements, and predict the properties of new elements yet to be discovered or synthesized.

08:45

The periodic table is a tabular display of the chemical elements, organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. The table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table can be used to summarize chemical behavior, and it is widely used in chemistry and other sciences as a tool to determine the chemistry of new substances.

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largest, the positive nap charged, experienced by an electron ionization energy is the value of energy that is not an isolated gaseous atom in the ground Elektronik state needs to be supplied with in order to just charge an electron. This results in a Catalan. If we have an organization energy of an element, we can calculate the effective nuclear charge we have that effective equals and square root of AII over 1312 So, for example, I've used lithium sodium potassium where I've put my full workings up on the screen and determined values of 1.261 point 844 and 2.26 respectively. All I've done is plugged numbers into that equation above where again, my full working out is on the screen for your reference. So, as we can see, said, F increases as we move down the group. Next, we're calculating, calculating, said F over and for the above elements again for lithium, sodium and potassium. So all I've done is plugged my numbers into the ZDF over an equation, and I've generated numbers of 9.639 point 6149.565 respectively, was said f over and decreases. As we move down the group

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