Anything that occupies space and has mass
What are the 3 states of matter ?
Solid, Liquid and gas
A change in state of matter
What is the 3 states of H2O ( water )
water, ice, vapor (steam)
What does the Law ( conservation of matter ) state ?
Matter can't be created or destroyed
What is mass ?
Quantity of matter/atoms an object has
What is weight ?
The force of gravity on an object
What are elements ?
Pure substances that cannot be broken down into simpler kinds of matter
How many elements are there ?
Over 100 elements
How many elements are important to living things ?
Approximately 20 elements
What 4 elements make up 90% of the mass of living things ?
Carbon, Hydrogen, Oxygen and Nitrogen
What is the simplest particle of an element that retains all the properties of that element ?
What is the central core of an atom which is made up of protons and neutron ?
What is a positively electrically charged particle called ?
What is a particle with no charge called ?
What is the name for the number of protons in an atom ?
What is a negatively electrically charged particle called ?
The number of PROTONS is equal to the number of ____________ in an atom ?
Where do electrons exist ?
In energy levels, orbitals or shells
What is the Magic # ( when we are talking about electrons ) ?
"8" 2 in first orbital, 8 in the second orbital, 8 in the 3rd orbital
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