Atomists
Who suggested that matter existed in the form of very small, indivisible particles
Democritus
What is the law that says
a. opposite electric charges attract each other
AND
b. like electric charges repel each other
law of electrostatic charges
The Bohr model is helpful because it is simple, easy to understand, is helpful for looking into chemical bonds, and represents energy in a simple way. What is one reason that we do NOT use the Bohr model?
It is not the MOST workable model.
Potassium-39 and Potassium-41 will have the same number of _____________?
Protons
What is NOT a way ions can form?
a. An atom gains electrons
b. An atom loses electrons
c. Atoms lose neutrons
d. All are leading to an ion
c
Who discovered the existence of electrons?
J.J. Thompson
What is the term for the behavior of matter and energy at the atomic and subatomic level?
Quantum Mechanics
Most of atoms are _______ ________.
Empty space
A sodium ion that lost an electron would be represented by + or -?
+
Which is not represented with a whole number?
a. atomic mass
b. atomic number
c. mass number
D. All of the above
a
True or False?
John Dalton thought atoms are indivisible and cannot be destroyed.
True
What do we call the unique number of protons in an atom?
Atomic number
Proton, neutron or electron?
What has a charge of +1e and determines the atom's identity?
Proton
An anion has a negative charge because it has gained or lost an electron?
Boron has 2 stable isotopes: boron-10 and boron-11. Boron's atomic mass is 10.81u Which isotope is more common?
Boron 10
OR
Boron 11
boron-11.
Chromium has
24 protons
28 neutrons
24 electrons
What is atomic number?
24
What do we call atoms of the same element with different amount of neutrons?
Isotope
What is the smallest of all subatomic particles?
electron
What is found in the nucleus with no electric charge and is the largest of all three particles?
Neutron
What is the result of a neutral calcium-44 atom that loses 2 electrons?
2- cation
2+ cation
2- anion
2+ anion
Becomes a 2+ cation
Chromium has
24 protons
28 neutrons
24 electrons
What is mass number?
52
Write the isotope name for phosphorous with
15 protons
18 neutrons
phosphorous-33
More protons than neutrons is what?
Anion
Cation
Cation
What does 2- indicate in an oxygen ion O2-?
Gained 2 electrons
Negative 2 charge
What is the result of a neutral calcium-44 atom that loses 2 neutrons?
Become: Calcium-46
Become: Calcium-42
Become: Calcium 44+
Become: Calcium 44-
Become: Calcium-42