Chem Flashcards
How many known elements? How many make up visible matter?
115 / 100
What percent of universe is visible matter
4%
Two sections of the atom
What subatomic particles are where
Nucleus Neutrons and protons
Outer shell electrons
The number of protons determines..
It is also called the
The charge is
The mass is
Where it is on the periodic table
Atomic number
Positive
1 amu
How do you get the atomic MASS number
Protons plus neutrons
What is a neutrons mass
What is its charge
1amu
NEUtrons NEUTRAL
What did Rutherfords gold foils experiment show
Atoms are mostly empty space and the center contains a dense + nucleus
How was the ruth gold experiment done
Directed alpha particles toward gold foil surrounded detector. Most passes right through
Atomic number is the number of ________
What’s the symbol
Protons Z
The atomic mass number is the
Protons plus neutrons
What two sub atomic particles should be the same number
When they are different what is it called
Protons and electrons
Ion
Isotope
Same atoms with different neutrons
Ions gain or lose
Are there ions on the periodic table
Electrons
No all elements on PT are neutral
Ionic substances dissolved…
When are atoms held too tight to move?
Conduct electricity
Ions carry the current if they can move
Solid NaCl must be liquid
Ionic compound
Has both
Contains a metal and a non metal
Positive and negative ions
Must cancel for net charge of zero
