Where are metallic elements found on the periodic table?
On the left side of the periodic table
100
What was the first theory of the atom?
Greek philosopher thought that when you cut down something as many times as you can there will come a point where you cannot divide the object anymore, he called this atomos
200
What is an atom made of?
protons, neutrons, and electrons.
200
What is an element?
It is a substance made up of entirely one type of atom.
200
Name at least 2 properties of metals.
-strong, good conductors of electricity, good conductors of heat, shiny when polished.
200
What was Mendeleev's contribution to the periodic table?
Mendeleev ordered the elements into groups and periods according to his atomic mass.
300
Identify where the proton, neutron and electron are located in the atom.
The proton and neutron are located in the centre (core) of the atom, and the electron is orbiting the core.
300
How many electrons fit into each shell around the atom?
2n^2
300
Name at least 2 properties of non-metals.
Brittle, poor conductors of electricity, poor conductors of heat, and solids, liquids or gasses in room temperature.
no matter what changes happen to the atom it cannot be destroyed or created, elements are made up of one atom, chemical reactions occur when atoms are re-arranged.