Atom
True or False: We now know exactly what atoms look like due to technology?
What is false
He made an atomic model that is referred to as the plum pudding model..
Who is Thompson?
This group of the periodic table are the least reactive group...
What are the noble gases or Group 8A?
These two subatomic particles are found in the nucleus. One of them has a positive charge and the other has no charge.
What are protons and neutrons?
The atomic number of Oxygen is 8. How many electrons does it have?
What is 8?
This number tells us the number of protons in an atom...
What is the atomic number?
This scientist came up with 4 propositions to make up his atomic theory. Although two have been revised, his propositions remain accepted today.
Who is Dalton?
Dalton based some parts of his atomic theory on this law, which states that matter cannot be created nor destroyed, but changes from one form into another.
What is the Law of Conservation of Mass?
For an electron to move to a lower energy level it must...
What is lose energy or emit light?
Carbon has an atomic number of 6. One of its isotopes is Carbon-13. How many neutrons does it have? (It's mass number is 13.)
What is 7?
What subatomic part of an atom has a positive charge?
What is a proton?
This atomic model is named after the man who studied electrons and figured out that they orbit the nucleus of the atom on electron shells or energy levels
Who is Niels Bohr?
An atom with 6P 6N and 6E and an atom with 6P 8N and 6E are called an ___________ of the atom.
What is an isotope?
These subatomic particles of an atom have a neutral charge and are located in the nucleus.
What is a neutron?
An atom of an element has a mass number of 38. It has 20 neutrons in its nucleus. How many protons does that atom have?
What is 18?
All matter is made up of these particles. Together, they can join with 2 or more other ones of different elements to form compounds.
What are atoms?
He passed alpha particles through a piece of thin gold foil and discovered that atoms must have a center mass (nucleus) with positive charges?
Who is Ernest Rutherford?
This electron cloud model is also called the _______ __________ model.
What is the Quantum mechanical model?
This number is the sum of the protons and the neutrons in the nucleus of an atom...
What is atomic mass?
This type of electron is in the energy level (or shell) that is farthest from the nucleus...
What is a valence electron?
Name at least two of the three features of electrons that make them different than protons:
What are location- not in the nucleus but orbiting the nucleus, charge (negative), and mass which is much smaller than a proton?
This philosopher believed that matter could be cut into smaller pieces, indefinitely (without stopping). His views on the structure of matter held for about 2,000 years.
Who is Aristotle?
Elements in a group (column) of the periodic table have similar ____________.
What are properties?
Look on page 95 at the sodium atom that has the atomic number of 11. Which electron(s) has the greatest energy?
What is the single electron on the outermost shell, the 3rd shell.
Look in your book on page 95 for figures 3.19 and 3.20. Look at the sodium atom that has an atomic number of 11. How many electrons are in the first energy level?
What is 2?