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First shell have 2 electrons maximum
Fill in the two then fill it outside
Second shell maxi 8
Third shell maximum 8
Can have more than 3 shells

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Relative mass-relative charge

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Protons-1-+1,Neutron-1-0,Electrons-1/1840-(-1)

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1. Proton no

2. Chemical name

3. Mass

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Protons=electrons no

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Some atoms are not stable. Some are stable.
Ions are stable

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The proton no is smaller then the mass no

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Atoms want to be neutral, not charged

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Isotopes have the same number of protons, but different number of neutrons

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5      6
X      X
7      7

No. They have different number of protons. So they are of different elements.

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Isotopes have the same no of protons ,but diffrent no of neu

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Can draw circle or X

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Fourth shell can go up to 18

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- Same period have same shell
Example: Period 1(has one shell)
- Group 0 won’t react with other atoms (Noble gases cause they are neutral) - inert(unreacting) the outer shell contains the maximum number of electrons
- Group 1 is most reactive
Why do different atoms have different outer electrons?

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Count shells and Write according to number of electrons per shell
2,8,8,18

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Are group seven elements reactive with group one group¿

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Why does sodium metal explode in the waters¿

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Why does sodium metal explode in the waters¿

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Bracket the electronic configuration which is stable, bracket and write positive or negative charge.

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Bracket the stable electronic configuration and write either positive or negative with the charge.

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When an elemenis charged,does it become more reactive?

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When an elemenis charged,does it become more reactive?

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Ions must have charge either positive or negative unlike atoms which is neutral.

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When do I know when to lose electrons or gain it?

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When do I know when to lose electrons or gain it?

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Drawing ions and how to draw it’s charge. 

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Drawing ions and how to draw it’s charge. 

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1st two has a positive charge as it has more protons than electrons.
2nd two has a negative charge as it has more electrons that protons.

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The atoms loose or gain electrons(s) depends on the number of electrons. If lesser atoms is required to add then loose, they will have a positive charge as they lose an electron and they number of protons(positive charge) is higher than the number of electrons (negative charge)Vice versa.