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Across the periodic table - Coggle Diagram
Across the periodic table
For Groups I to VII, the group numbers is the same as the number of outer shell electrons in the atoms
Melting and boiling points rise to te middle of a period then fall to very low values
The elements of VIII group has a full outer shell. So they're
stable
and
unreactive
They reach the outer shell by taking part in reactions, losing or gaining electrons
I Group's elements lose an electron
To achieve the complete outer shell
II Group's elements lose 2 electrons
III Group's elements lose 3 electrons
VI Group's elements gain 2 electrons
VII Gropu's electrons gain an electron
The number of electron shell in the atom affects reactivity
The number of outer shell affects reactivity
The fewer electrons lose or gain, the less energy is needed
Density generally decreases down all groups
The elements, in a period, changes from metals to non-metals. The elements in the middle are called
metalloids
They can conduct electricity, like metals, so they're called
semi-conductors
The oxide of metals are
basic
, they react with acids to form salts
The oxide of non-metals are
acidic
, they react with alkalis to form salts
metalloids oxide are in beetween: they react with both acids and alkalis to form sals
It is called
amphoteric oxide
Reactivity decreases across the metals and increases across the non- metals