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A period is a row of elements. All elements in a period has the same number of shells.
there are 7 periods & are expressed with Arabic numerals.

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A column of elements is a group. All elements in a group has the same amount of valence electrons.
There are 8 groups in total & are expressed with Roman numerals

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You draw the symbol in the centre & draw a small circle around it the circle is the 1st shell. You then draw shells as circles & draw electrons as crosses

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electrons has 19 electrons .one easy way to check is to look at period. one valance electrons two valance sodium is one valance 3 shells and oxygen is grp 6 shell 2. periodic table song . great

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Mr wen says draw stuff on notes

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Ok

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Calcium has 20 electrons

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The proton number is usually the same with the amount of electrons

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Atoms can lose or gain electrons

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Normally atoms are nuetral

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Neutral means that no net charge

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No of protons is equal to no. Of electrons

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Number of protons equals to number of electrons

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Da photo

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Atoms charge when they gain or lose electrons

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Atoms can lose or gain electrons

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Lithium has 3 atoms

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There is a concept called stability

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Atoms will try to have full shells

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Lithium can lose that electron or gain 7 electrons

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Atoms will try to have full shells depends on number of valence electrons

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Depends on the no of valence electrons

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When atoms gain electrons, you must put a bracket and write ‘x+’ where ‘x’ is the amount of electrons gained to specify.

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If atom have <4 valence electrons it will tend toward losing the electrons

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If having more than 4 tend towards gaining electrons

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Chlorine has big shells . Potassium has 19 electrons . 4 shells.

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Chlorine has big shells . Potassium has 19 electrons . 4 shells.

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Yes

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Before group 4 is cation

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After group 4 I’d an anion

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by right : no.of proton is equal to no. of electrons

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our atoms wants to be more stable

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the atoms will lose/gain electrons to become ions

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they become compounds

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ions - atoms have more/less electrons than protons

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ions - atoms have more/less electrons than protons

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eg. if sodium wants to give away an electron and chlorine wants an electron, they exchange and then they form a compound

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eg. if sodium wants to give away an electron and chlorine wants an electron, they exchange and then they form a compound

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cation is positive and anion is negative

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cation is positive and anion is negative

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this is because before group 4, it is easier to lose an electron than gain one

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this is because before group 4, it is easier to lose an electron than gain one

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while after group 4 , it is easier to gain an electron than lose one

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while after group 4 , it is easier to gain an electron than lose one

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Let's play a game. The rules are on the thingy at the bottom

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Let's play a game. The rules are on the thingy at the bottom

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atom which lost electrons will have a negative charge. Thus becoming a cation.

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if atoms have full valence shell, they are stable

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If atoms do not have full valence shell, they are unstable

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atoms will try to have a full valence shell

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atoms will try to have a full valence shell

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they either gain or lose electrons

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lose elctrons and minus minus charges

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they gain electrons

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plus negative charge

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atoms which gained electrons will have a positive charge. Thus becoming an anion

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noble gases are inert and do not react with anything

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will form compounds

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They react to nothing. Since they are inert, ( root word inertia ) they will neither gain, or lose electrons.

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Ppppppp

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Food: All over the world, parents tell teens to avoid pizza, chocolate, greasy and fried foods, and junk food. While these foods may not be good for overall health, they don't cause acne or make it worse. Studies show dairy products and high glycemic foods, however, can trigger acne.

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may 2019