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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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## Trends on the Periodic Table
## Rows
- Same energy level in each period
- Same number of valence electrons in each group
- Across a row/period $`\rightarrow`$ more $`p^+`$ in nucleus $`\rightarrow`$ greater attraction to $`e^-`$
- 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
<table>
<tr>
<th>Trend</th>
@ -81,6 +65,24 @@
</tr>
</table>
## Rows
- Same energy level in each period
- Same number of valence electrons in each group
- Across a row/period $`\rightarrow`$ more $`p^+`$ in nucleus $`\rightarrow`$ greater attraction to $`e^-`$
- 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
- They tend to lose electrons
- They are shiny, ductile, malleable, conductive