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Update Unit 1: Chemistry.md

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Grade 10/Science/SNC2DZ/Unit 1: Chemistry.md
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- Involved in studying, varifying information (eg the periodic table -> Describes the elements -> pure susbtances made of only one kind of atom),and publishing. - Involved in studying, varifying information (eg the periodic table -> Describes the elements -> pure susbtances made of only one kind of atom),and publishing.
## Trends on the Periodic Table ## Trends on the Periodic Table
## Rows
- Same energy level in each period - Same energy level in each period
- Same number of valence electrons in each group - Same number of valence electrons in each group
- Across a row/period $`\rightarrow`$ more $`p^+`$ in nucleus $`\rightarrow`$ greater attraction to $`e^-`$ - Across a row/period $`\rightarrow`$ more $`p^+`$ in nucleus $`\rightarrow`$ greater attraction to $`e^-`$
- s - Atomic radius decreases as you move acroos a row/period, due to more protons in the nucleus that attract the negatives.
- Atomic radius is the from the center of the atom (nucleus) to the outer most shell (valence shell)
## Columns
- down a column, increase of energy level, as you move down
- every atom has only one valence shell (cause its the most outer shell)
- if valence shell is further away from the nucleus, less attractive force between nucleus and valence $`e^-`$
- more energy levels where $`e-`$ can be
- Negative electrons are repeling the valence shell electrons `(shielding)`
- `Shielding` "inner electrons" repel valence electrons and "block" attraction force between valence electrons and nucleus
- Atomic radius increases as you move down a column/group
## Metals ## Metals
- They tend to lose electrons - They tend to lose electrons
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- They are dull, bad conductors - insulators - They are dull, bad conductors - insulators
- Tend to gain electrons - Tend to gain electrons
- The have a strong hold on electrons - The have a strong hold on electrons
## Bonds
- An ionic bond is a bond between a negative ion and a positive ion (so a anion and a cation)
- An convalent bond is a bond between 2 non-metals
- An ion is a charged particle
- An anion is formed when an particle gains electrons
- An cation is formed when an particle loses electrons
- We can use modesl(e.g Lewis dot diagrams) to show bonding
- Atoms will lose or gain electrons to achieve noble gas $`e^-`$ configuration $`\rightarrow`$ The most common stable ion. (eg, if $`Na`$ loses electrons, it becomes like $`Ne`$, if $`Cl`$ gains an electron, it becomes like $`Ar`$)
- To show that atoms are different than ions, we put square brackets around it $`[Na]`$, then we put superscript on the top right to show its charge, $`[Na]^+`$ (if the charge is only a $`\pm 1`$, we just put a $`+`$ instead of $`+1`$)
## Non Metal Ionic Names
|Name|Name|
|:---|:---|
|Hydride|Boride|
|Carbide|Nitride|
|Oxide|Fluoride|
|Silicide|Phosphide|
|Sulphide/Sulfide|Chloride|
|Arsenide|Selenide|
|Bromide|Telluride|
|Iodide|Astitide|