Atoms, elements, compounds

Cards (15)

What are elements? 
elements are substances made up of one type of atom
What are atoms made from
Protons, neutrons, electrons
relative mass of proton
1
relative mass of neutron
1
relative mass of electron
very small
relative charge of proton
+1
relative charge of neutron 
0
relative charge of electron  
-1
How can we use the periodic table to determine the structure of an atom? 
Top number - atomic number (equal to the number of protons in the nucleus of an atom) Bottom number- mass number (sum of protons and neutrons in the nucleus of an atom)
How are electrons arranged in an atom?
The energy levels closest to the nucleus fill first, the first energy level can hold up to 2 electrons, the seconds energy level can hold up to 8 electrons, the third energy level can hold up to 8 electrons
What are metals? 
Elements that are typically shiny, malleable, and good conductors of heat and electricity.
What are non-metals? 
Elements that are poor conductors of heat and electricity, and are typically brittle and dull in appearance.
What are compounds? 
Substances formed by the chemical combination of two or more elements.
How are compounds formed?
Through chemical bonding between atoms.
How are the properties of compounds different to the elements that
combined to make them?
When elements are combined new properties are created