Atomic Structure
What 3 subatomic particles make up an atom?
Protons, Neutrons and Electrons
What are positive ions known as and what are negative ions known as?
Cations and Anions
6023 expressed in sci notation
6.023 x 103
How many neutrons in C-14
8 neutrons
Who designed the gold foil experiment
Ernest Rutherford
What do the protons and neutrons make up in an atom?
The Nucleus
What would be the charge of an ion that has 70 protons, 140 neutrons and 69 electrons?
+1
How many particles make up a mole?
6.022 x 10 23 ( Avogadro's number)
Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
Cl-35 is more abundant
75% relative abundance expressed as a frequency.
0.75
In an atomic model where are the electrons found?
Moving around the nucleus
What is the atomic symbol for a fluorine ion
919F1-
0.000823 expressed in scientific notation
8.23 x 10-4
How are radioactive isotopes different from other isotopes?
They have unstable nuclei.
What subatomic particle did JJ Thompson discover?
The electron
What is the mass of a electron in ATOMIC MASS UNITS(amu)?
1/1837 amu or 0 amu
How does an atom become a cation?
It loses electrons.
What is the molar mass C8H18
114.2g/mol
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average mass of this element?
74.92 amu
Which particle is shown:
+10e
positron
How many neutrons does an atom of Uranium-234 have?
142 neutrons
How many electrons does an oxygen ion have? [hint: find the charge of an oxygen ion first]
10 electrons
How many moles are in a 12.7 g of CaF2
0.16 mol
8 grams
The type of radiation made up of helium nuclei.
Alpha radiation