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Groups | Secondary Science 4 All, Study notes of Chemistry

Stanford UniversityChemistry

is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals ...

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2022/2023

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Groups
Elements in the same group in the periodic table have similar chemical properties. This
is because their atoms have the same number of electrons in the highest occupied energy
level. Group 1 elements are reactive metals called the alkali metals. Group 0 elements
are unreactive non-metals called the noble gases.
A vertical column of elements in the periodic table is a group. The elements in a group have similar
chemical properties to each other. For example, group 1 contains sodium and other very reactive
metals, while group 7 contains chlorine and other very reactive non-metals. Group 0 (also known as
group 8 or group 18) contains helium and other very unreactive non-metals.
The modern periodic table
Note that you will never find a compound in the periodic table, because these consist of two or more
different elements joined together by chemical bonds.
The group 1 elements are found on the left hand side of the periodic table. They are called the alkali
metals because they form alkaline compounds.
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Groups

Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals. Group 0 elements are unreactive non-metals called the noble gases. A vertical column of elements in the periodic table is a group. The elements in a group have similar chemical properties to each other. For example, group 1 contains sodium and other very reactive metals, while group 7 contains chlorine and other very reactive non-metals. Group 0 (also known as group 8 or group 18) contains helium and other very unreactive non-metals. The modern periodic table Note that you will never find a compound in the periodic table, because these consist of two or more different elements joined together by chemical bonds. The group 1 elements are found on the left hand side of the periodic table. They are called the alkali metals because they form alkaline compounds.

Group 1 of the periodic table Their atoms all have one electron in their highest occupied energy level (outermost shell). This gives the group 1 elements similar chemical properties to each other.

Group 1 elements

Element SymbolElectronic structure (written)Electronic structure (drawn)

lithium Li 2,

sodium Na 2,8,

potassiumK 2,8,8,

Reactions of group 1 elements with water

The noble gases - Group 0 The highest occupied energy levels (outermost shells) of their atoms are full: helium atoms have two electrons in their outer energy level atoms of the other noble gases have eight electrons in their outer energy level. This is a neon atom it has a stable arrangement of electrons, and makes the group 0 elements unreactive. Now try a Test Bite.