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What are in the electron cloud?
Electrons
What’s in the center or nucleus of an atom?
Protons and neutrons.
What are atoms?
The smallest unit of measurement.
What are atoms shaped like?
Spheres
The ______ is made of protons and neutrons.
Nucules
A pure substance made of only one type atom
An element
A substance formed when 2 different elements bond together.
A compound
H2O is made of what atoms?
2 hydrogen 1 oxygen
What are the 4 most common elements.
C.H.O.N or Carbon, Hydrogen, Oxygen, and Nitrogen.
What phase change is liquid to solid?
Freezing
What phase change is gas to solid.
Deposition
When atoms are frozen how do they move.
Shake or vibrate
How many elements are on the Periodic Table of Elements.
118
How are the elements organized on The Periodic Table of Elements.
By their atomic number.
When atoms are in a gas how do they move?
They move freely
When atoms are solid they are…?
Tightly packed
What are the horizontal rows on the Periodic Table of Elements.
Periods or Groups
What phase change is liquid to gas?
Vaporation
What phase change is solid to liquid.
Melting
What are the rows on the Periodic Table of Elements called.
Groups or families.
What are the atomic numbers of Carbon and Nitrogen
6 and 7
How to calculate the number of neutrons in an element or compound.
Atomic mass - Atomic number = number of neutrons
What phase change is Gas to liquid?
Condensation
What phase change is solid to gas?
Sublimulion
What is U-235
What is uranium