Atomic structure review
Which subatomic particle is negatively charged
electron
which particle has the least mass?
electron
Two atoms of the same element must have the same..?
number of protons
Does knowing how many electrons a NEUTRAL atom has, tell you it's elemental identity? If so how?
# Protons= # Electron in a neutral atom
Lithium has two isotopes, one with a mass of 6.015 amu and an abundance of 7.42%, and the other with a mass of 7.016 amu and abundance of 92.58%. What is the atomic mass of Li?
(6.015 x 7.42) + (7.016 x 92.58) ------------------------------------- = 6.94 amu 100
Naturally occurring copper consists of two isotopes 69.1% , 63Cu with a mass of 62.9 amu and 30.9%, 65Cu, which has a mass of 64.9 amu. Calculate the average atomic mass of copper.
(62.9 x 69.1) + (64.9 x 30.9) ---------------------------------- = 63.5 amu 100
What is the nuclear charge in an atom of boron?
+5
What did Rutherford conclude?
-The atom is mostly empty space -The nucleus is composed of protons and neutrons -The electrons are distributed around the nucleus
What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?
39
In the atom Indium, which has a mass number of 113, how many protons, neutrons, and electrons does it have?
49 protons, 49 electrons, and 64 neutrons
What are the name and symbol of the element which has 33 protons, 42 neutrons, and 33 electrons
75 As 33
The nucleus of an atom consists of 8 protons and 6 neutrons. The total number of electrons present in a neutral atom of this element is?
8
What is a mixture
A blend of two or more pure substances
What is a heterogeneous mixture?
A mixture that contains visibly DIFFERENT parts
What is a Homogeneous Mixture or solution
A mixture that does not contain visibly different parts, looks uniform throughout
What is an example of a heterogeneous mixture?
A salad, Cinnamon and sugar, Trial mix
What did Democritus believe?
All things are made up of atoms
What are examples of Homogeneous mixtures?
Aqueous solutions, salt water, milk, cool aid, sprite, Gaseous solutions, air H2 and O2
Who disagreed with Democritus?
Aristotle
What is the smallest particle of an element?
Atom
All atoms of an element have the same
Atomic number
What is the number of protons in the nucleus referred to as?
Atomic number
Who created the Billiard ball model?
Dalton
What are the circles around the nucleus called? What particles resides in them, and who is credited for this model?
Electron orbits or orbitals, electrons, and Bohr
What was Millikan's main contribution to atomic theory?
He determined the size of the charge of an electron
What did Rutherford expect to happen in his experiment, and what actually happened?
He expected it to go through the gold atoms, but they deflected all over, and even back at him.
What is an isotope? How does one isotope differ from another isotope?
Isotopes are atoms with the same number of protons, but a different number of neutrons which result in different mass numbers.
Who created the plum pudding model?
J J Thompson
The total number of particles in the nucleus is referred to as...
Mass number
What did Thompson determine the charge of an electron to be?
Negative
The atomic number is always equal to the total number of..?
Protons in the nucleus
What are the three fundamental subatomic particles?
Protons, Neutrons, and electrons
Who is responsible for Wave particle duality of the electron.
Schrodinger/Quantum Mechanical Model
What else did J J Thompson discover?
The charge to mass ratio
A sample of element X contains 90% X-35 atoms, 8.0% X-37 atoms, and 2.0% X-38 atoms. What is the atomic mass closest to?
35
What is wrong with this symbol 12 C 7
Carbon must have 6 protons therefore the atomic number can't be 7
What subatomic particle was discovered in the Cathode Ray tube experiment?
Electron
Which of the five principles are not held true today? (I I W C/D)
Identical and indivisible
What is I I W C/D?
Indivisible, identical in mass and size, Whole number ratio, Can't be created or destroyed
Two atoms of the same element that have different mass numbers are called..?
Isotopes
What part of the atom is Rutherford credited for discovering?
The nucleus
What was Millikan's experiment.
The oil drop experiment
Examples of compounds
Water, Table salt, and Ghlucose
Where are electrons most likely found in an atom?
the orbital