Unit 1 Periodic Table And Atomic Strucutre
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How are elements arranged?
Element arranged in order of increasing atomic number
Why are elements grouped together?
Elements be have similar chemical properties are grouped together
What is a group?
A vertical column of elements
What is a period?
Horizontal group of elements
What physical properties do metals have? (7)
• conduct heat • conduct electricity • sonorous- makes a sound when hit • ductile- can be drawn to make a wire • malleable- can be hammered to form sheets • strong • solid at room temperature
What is group one in the periodic table?
Alkali metals
What are alkali metals?
Very reactive soft metals- must be stored under oil to stop reactions of air and water. Reactivity increases down the group.
What is group 7 in the periodic table?
Halogens
What are the halogens
Most reactive non-metal elements. Made up of solids, liquids and gases.
What is group 0 of the periodic table?
Noble gases
What are noble gases
Very unreactive, colourless gases.
What is the atom made up from
The atom is made up of a centre called the nucleus contains protons and neutrons and electrons which are found in a space around the nucleus and electron shells
What always has the same number of protons
Electrons
What is the location of a proton?
Nucleus
What is the location of an electron?
Outside the nucleus in shells
What is the location of a neutron?
Nucleus
What is the charge of a proton?
+1
What is the charge of an electron?
-1
What is the charge of a neutron?
0
What is the mass of a proton?
1
What is the mass of an election?
Almost 0
What is the mass of a neutron?
1
What is the same as an atomic number?
The number of protons
What are the numbers of the elements called?
The atomic number