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Bonding - PowerPoint PPT Presentation


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Bonding. When 2 or more elements chemically combine, we say they have bonded . Bonding rule : Atoms “want” to have a full valence level. They can give or take electrons from other atoms to achieve this and be “happy”. . Example. Na +. Cl -. NaCl. Example 2. Br -1. Ca +2. Br -1. CaBr 2.

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slide1

Bonding

When 2 or more elements chemically combine, we say they havebonded.

  • Bonding rule: Atoms “want” to have a full valence level.
  • They can give or take electrons from other atoms to achieve this and be “happy”.
slide2

Example

Na+

Cl-

NaCl

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Example 2

Br-1

Ca+2

Br-1

CaBr2

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All these elements want to get rid of 2 valence electrons

All these elements don’t want to give /share ANY electrons (non-reactive)

All these elements want to gain 1 valence electron

Elements with the same # of valence electrons will react similarly with other elements.

Elements in same group have similar chemical properties (reactivity)

you try it
You Try It!

Draw energy level diagrams (Bohr models) for the following atoms, then use those diagrams to show how they would bond and write the chemical formula.* You may use as many atoms of each element as you need.

Hydrogen(H) and Oxygen (O)

Magnesium (Mg) and Oxygen (O)

Lithium (Li) and Sulfur (S)

Beryllium (Be) and Fluorine (F)

*Challenge: write the number of protons and neutrons in the nucleus

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H

1.

H2O

H

O

2.

MgO

O

Mg

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Li

S

Li2S

3.

Li

F

BeF2

4.

F

Be

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