Atomic Models
Who proposed the first experimental atomic model?
John Dalton
What is the charge of a proton?
Positive.
Which law states that elements combine in fixed, whole number, rations by mass?
What do isotopes of the same element have in common?
The same number of protons.
The atomic number of an element is the number of _____ in its nucleus.
Protons.
What experiment led to the discovery of the atomic nucleus?
Rutherford's gold foil experiment.
What is the relative mass of an electron compared to a proton?
About 1/1800th of the mass.
Who proposed the law of definite proportion?
Joesph Proust.
What is the isotopic notation for hydrogen with a mass of 3?
H31.
How many neutrons are in X7533?
42.
Which scientist used cathode rays to discover electrons?
J.J. Thomson
Which subatomic particle was the last to be discovered?
Neutron.
What does the law of multiple proportions describe?
Elements combine in ratios of small, whole numbers to form different compounds.
Write the isotopic notation for potassium with 19 protons with 19 protons and 21 neutrons
K4019.
What is the mass number of an atom with 8 protons, 8 neutrons, and 8 electrons?
16.
Name the two ancient philosophies about the matter.
Atomism and the continuous theory of matter.
Place the three subatomic particles in order of increasing mass.
Electron, Proton, and Neutron.
What theory suggests that it can be infinitely divided?
Continuous theory of matter.
What is the atomic mass of Chlorine?
35.453 u.
What is the mass number of an atom with 20 protons and neutrons and 18 electrons?
40.
What did Rutherford's model propose about the structure of an atom?
The nucleus is a small—dense, positively charged neutron.
How many protons, neutrons, and electrons are in the neutral atom of Co5927
27 protons, 32 neutrons, 27 electrons.
Who discovered X-Rays?
Wilhelm Roentgen.
What makes isotopes of the same element chemically identical?
Having the same number of electrons, which determines chemical behavior.
One-twelfth the mass of carbon-12 is called a(n) _____
Atomic mass unit (AMU).