Moles
What is Avogadro's number?
(6.02x1023)
What is the atomic number for Silicon?
14
What particle was Bohr primarily concerned with when developing his model of the atom
The electron
Name the 3 particles that make up the atom
Protons, electrons, neutrons
Who said that the atom was indivisible, and the smallest unit of matter
Dalton
How many atoms of Hydrogen are in 1 mole of Hydrogen?
(6.02x1023) atoms in 1 mole Hydrogen
How many protons are in the nucleus of an Argon atom?
18
Draw the Bohr model for Sulfur
Sulfur is in the 3rd row of the periodic table and has 16 electrons. This means its Bohr model will have 2 full energy levels, and a 3rd energy level with 6 electrons in it.
Explain how the atom is made up of negatively charged electrons and positively charged protons, and still has an overall neutral charge
Who discovered the electron?
JJ Thompson
How many Neon atoms are in 1.5 mole of Neon?
1.5(6.02x1023) = (9.03x1023) atoms
How many neutrons does an atom of Hydrogen have in its nucleus?
Zero
Draw the Bohr model for Calcium
Calcium is in the 4th row of the periodic table and has 20 electrons. These electrons are dispersed among 4 energy levels. The first 3 are full, with 2, 8, and 8 electrons in each level respectively. The 4th energy level has 2 electrons in it.
Where in the atom can we find the protons and neutrons
The nucleus
Which model of the atom featured electrons embedded evenly within a positively charged sphere
Thompson's "Plum-pudding" model
How many Ca atoms in 0.015 moles of Ca
0.015(6.02x1023) = (9.03x1021) atoms
What is the atomic mass of Germanium
72.64 grams/mole
How many electrons can the 2nd energy level hold in Bohr's model?
8 electrons
Where can you find the electrons in the atom
Orbiting around the nucleus
Rutherford is known for discovering a certain region of the atom by bombarding sheets of gold foil with positively charged particles. What region did he discover?
The nucleus
What is the atomic mass of Helium, and what does that mean?
4.003 grams per mole.
1 mole of Helium, which is (6.02x1023) atoms of Helium, has a mass of 4.003 grams.
What does the atomic number tell you about it's corresponding element?
The number of protons in 1 atom of that element
What did Bohr say about the nature of the energy levels in his models? Could electrons be found in between the energy levels?
Electrons could be found only within the definded energy levels, not in between them. Therefore, his energy level are referred to as being quantized.
What is the most fundamental difference between atoms of two different elements?
The number of protons in the nucleus of the atom
Rutherford discovered the nucleus with his gold foil experiment. What else was Rutherford able to determine about the nature of the atom by conducting this experiment. (Hint, how big or small did he determine the nucleus to be)
The fact that a large majority of the particles went straight through the sheet showed that most of the atom is composed of empty space and that the nucleus was a very small region of the atom.