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Why do atoms on the periodic table have the number of valence electrons that they do?

I’m studying year 11 and am learning about Valence electrons and how these electrons drive inter-molecular bonds. What I have not been able to find an explanation to is why all the elements on the periodic table have the number of valence electrons that they do. To me, it seems intuitive that if the Halides […]

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Phenol vs 4-hydroxypyridine – Enol Content

Which has a higher enol content; phenol or 4-hydroxypyridine? The solution to this question in my book says that phenol has a higher enol content due to aromaticity. But 4-hydroxypyridine is also stabilized by resonance. So how does that affect enol content?

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I am simulating for LiH molecule by hartree fock method, but I am not cleared about its chemical accuray calculations

Is there is a formula for calculating the chemical accuracy or any other optimizer used? Its energy is HF energy: -8.860622387537344

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Thermochemistry questions regarding $\Delta$H

I have a few questions about heat of combustion. I have two different scenarios that I was to present: Scenario 1: Given heat of combustion in the equation $\ce{CH4 + 2O2 => CO2 + H2O}$ and $\Delta H=-889kJ/mol$ Q1: Would 1 mol of methane produce 889kJ; whereas, 1 mol of oxygen would produce 444.5kJ? Scenario […]

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Xe compounds – without O or F

I may be wrong, because this is purely based on observation-Is it true that Xe does not form compounds without O or F? If yes, could you please elaborate the reason behind it? (I have a basic understanding of VBT, VSEPR and hybridisation) Any help will be appreciated. Thanks!

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Finding values within an Array/Mapping based off min and max values

I want a user to be able to place a bet on some number, between a range of numbers. So the user wants to place a bet on the numbers 50-500. Then there is a function that sees if the number has been bet on – such as hasBet(uint256 number_to_check) Lets say the user places […]

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Linux Mastering Development

Mixed DPI across multiple monitors with xrandr

I am running i3 window manager on Arch Linux, and am trying to use xrandr to use both my laptop screen and desktop monitor together. I intend the screens to have separate workspaces but to be able to move workspaces between monitors as needed. The laptop screen is 4K (3840×2160) but the monitor is only […]

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Linux Mastering Development

What to do when which command returns “type: bad option: -l”?

I’m trying to figure out which python version I am using, so I am running which python. Yet every time I’m running it, I receive the error message "type: bad option: -l". What can I do to make the error message go away? I know that which should best be avoided. What could I use […]

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Linux Mastering Development

Problems with Intel Centrino Ultimate-N 6300

I edit /etc/modprobe.d/iwlwifi11n.conf like this: when I set: options iwlwifi 11n_disable=8 I get high speeds but i have connection drop outs.. when I set options iwlwifi 11n_disable=1 I get slow speeds but there are no drop outs… How can i get high speeds with no connection drop outs ? Here is the wireless-info: https://pastebin.com/3wf1fg8s

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Linux Mastering Development

Cannot get “apt-get install” or “apt install” to work on Kali Linux VM

I recently downloaded one of the prebuilt Kali Linux VMs for VirtualBox (64 bit), and was trying to install the library python3-pip onto it. However, the commands "apt-get install python3-pip" and "apt install python3-pip" did not work, and kept returning the error of: "E: Package ‘python3-pip’ has no installation candidate". The same error occurs when […]