CHAPTER 2 ( SCIENCE ) : Atoms and elements Flashcards
How are solid particles arranged?
- held together strongly and tightly packed together
* can vibrate but they stay in the same place
What are the properties of a solid?
rigid, fixed shape and fixed volume
How are liquid particles arranged?
- held together weakly and can move past each other
* can change shape and can flow
What are the properties of a solid?
not rigid, not fixed shape and fixed volume
How are gas particles arranged?
- held far apart and do not touch each other
* can change shape and can flow
Who was the famous Greek philosopher from thousand years ago?
Democritus
Democritus developed a new theory which stated that matter consists of _______ called ______
invisible particles, atoms
Democritus called tiny pieces of matter _____, which means it cannot be _____
atoms, divided
There are many different types of atoms which have different _____ and different _____
sizes, properties
What is the defining feature of an atom?
It’s what makes one atom _____ from another. We also call this the __________
The number of protons in an atom
different, Atomic Number
Orange colour atom —
Grey colour atom —
Blue colour atom —
Proton
Neutron
Electron
Scientists have discovered _____ different kinds of atoms that occur naturally in the Universe and a further _____ kinds have been made in laboratories.
94, 24
What is an element?
An element is a substance that is made up of just one kind of atom
The particles in a gas are not arranged in a pattern; they ____
move in random directions
Which of these is the smallest particle?
a) Atom
b) Element
c) Gas
d) Liquid
a) Atom
