Vocab
Define the atomic number.
What is the number of protons in an atom.
If the atomic mass is 27, and the atomic number is 13. Solve to find the number of neutrons.
What is 14?
Define average atomic mass.
What is the weighed average of all natural occurring isotopes in an element.
What year did Democritus present his theory?
What is 400 B.C.
What is the first element.
What is Hydrogen
Define element.
What is a pure substance made of one atom?
Name the number of electrons in the first three rows.
What is 2,8,18 electrons
If lithium has the atomic mass of 7, and 3 protons. Then how many neutrons are there. (no calculartors)
What is 4?
Who presented the Plum Pudding model?
What is J.J. Thomson?
What are elements made up of
What is atoms
This particle has no charge/neutral charge.
What are neutrons.
These two particles are found in the nucleus.
What is protons and neutron?
Define isotpe.
What is atoms of the same element with a different number or neutrons.
Who first discovered atoms?
What is Democritus?
True or False The mass # is determined by the mean of the isotopes.
What is True
Define Valence Electrons.
What is high energy electrons that sit on the farthest level orbit in an atom?
What is the equation to find the number of neutrons in an element?
What is Atomic mass- Atomic number?
How many isotopes does oxygen have?
What is 3?
What is 1911?
Over or Under. There are 119 elements in the periodic table.
What is Under
Quarks make up these things.
What is protons and neutrons?
Summarize the structure of an atom.
What is a Nucleus made up of neutrons and protons, surrounded by a electron cloud?
What if they help scientists make medical diagnostics, study the environment, and carbon date.
The difference between Bohr's model and the current model is...
What is electrons orbit the nucleus instead of being in an electron cloud/random space?
If golds atomic mass is 197 and it has 79 electrons find the missing particles
What is 79 protons and 118 neutrons