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Positively charged ions
Electron occupy the space around the outside of the nucleus
Negatively charged ions
- Charged atoms.
- Differ by number of electrons.
Mass Number =
Number Protons + Number of Neutrons
The number of protons in the nucleus
Perodic Table Box
Elements are ...
- The basic building blocks of all matter
- They are substances which cannot be chemically decomposed any further
- They are made up of only one type of atom
- It is made up of sub-microscopic particles called atoms
- It makes up everything around us
- Matter takes up space therefore it has volume which can be measured
- Matter has mass and therefore can be weighed
How are compounds formed?
Compounds are formed when two or more elements are chemically combined
Properties of Metals
Metals are shiny, good conductors of electricity and heat, they are ductile (able to be drawn out into wire)
Properties of Non-Metals
Non-metals are poor conductors of heat and electricity, dull.
Properties of Metalloids
Metalloids can be defined as those elements which exhibit characteristics of both metals and nonmetals.
Ionic compounds generally contain at least one metal and one non-metal that are chemically joined together in what is called a bond.
What do metals form when they lose electrons?
Metals form cations or positive ions when they “lose” electrons. As a result of this electron transfer a chemical bond is formed and an ionic compound is formed.
What do non-metals form when they receive?
Non-metals form anions when they receive electrons. As a result of this electron transfer a chemical bond is formed and an ionic compound is formed.
What charge does an atom have?
- In an atom there is always an equal number of protons and neutrons, so an atom has no overall charge.
- Differ by number of protons.
The valency of an ion is the charge, positive or negative, which it has when it forms an ionic compound.
The nucleus of an atom is made up of protons and neutrons and is surrounded by electrons.
- Atoms of the same element with different mass numbers.
- They differ by number of neutrons.
- Number of electrons allowed in each shell
Periodic Table - Group Number
The group number corresponds to the number of electrons in the outer shell. Groups go down the periodic table.
Periodic Table - Period Number
The period number refers to the number of outermost shell containing electrons. Periods go across the periodic table.
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