Curriculum

Course: Science — First Preparatory

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Curriculum

Science — First Preparatory

Unit 1: Matter

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Unit 2: Forces

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Unit 3: Life

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Unit 4: Earth and Space

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Text lesson

The Periodic Table

Science — First Preparatory

The Periodic Table

Order of the elements and layout of the table

Order of the elements and layout of the table

In the modern periodic table the elements are arranged in increasing order of their atomic number, which is the number of protons in the nucleus of each atom.
The table has 7 periods (horizontal rows) and 18 groups (vertical columns).

Comparison aspect	Main idea	Keywords
Period (row)	the number of energy levels occupied by electrons in the atom. An element in period 3 has electrons in 3 levels	numberenergylevelsoccupied
Group (column)	linked to the number of electrons in the outer level which take part in chemical reactions	linkednumberelectronsouter
•	Elements are divided into metals which lie on the left and centre of the table and are shiny good conductors of heat and electricity and malleable non-metals which lie on the right and noble gases which lie in group 18 and are very stable because their outer level is full	Elementsdividedmetalsleft

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