Chapter 7-elements Flashcards
What are elements
Elements are pure substances made of only one kind of atom
What is a compound?
A compound is the simplest form of a material that contains two or more elements in a fixed proportion often with different properties than the elements from which it is formed
The two types of elements are?
Metals and non metals
____ on the left side of the periodic table and ____ on the right side
Metals
Non-metals
Which is high or low in lustre
Metal-high
Non-metal-low
Good/poor in heat conduction
Metal-good
Non-metal-poor
Good/poor in conduction of electricity
Metal-good
Non-metal-poor
Good/poor in ductility, malleability
Metal-good
Non-metal-poor
Good/poor on hold on electrons
Metals-poor
Non-metals-good
Size _____ down a group
Increases
Size ____ across a period (left to right)
Decreases
Reactivity ____ as you go down the groups on the left side
Increases
Reactivity ______ as you go down the groups on the right side
Decreases
A short hand symbol has the element ______ , the top number showing the ____ ____, and the bottom number showing the ____ ____
Symbol
Atomic mass
Atomic #
What are isotopes
Atoms with the same number of protons but have a different number of neutrons
