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Which is not one of Dalton's hypotheses of atomic theory?
E) The atoms of one element are the same as atoms of another element.
When methane is completely combusted in oxygen forming carbon dioxide and water, how does the mass of the reactant gases compare to the products?
C) The masses of the reactants and products are equal.
Cathode rays are composed of what fundamental particle?
D) electrons
Which scientist developed the nuclear model of the atom?
D) Ernest Rutherford
Rutherford's gold foil experiment determined that
C) most of the space in an atom is empty except for a concentrated area called the nucleus.
A mass spectrometer measures neon to have two masses: 20 and 22 atomic mass units. These are:
A) Isotopes
The element antimony (Sb) has an atomic mass of 121.76 amu. Two naturally occurring isotopes of antimony are ¹²¹Sb (57% abundant) and ¹²³Sb (43% abundant). In a sample of 100 Sb atoms, what is the probability that a single selected atom has a mass of 121.76 amu?
A) 0%
Which has a greater mass?
B) Proton
Which of the following pairs represent isotopes?
C) ²⁸Si and ²⁹Si
How many protons are in an atom of Fe?
26
What is the mass number for an atom of barium containing 56 protons and 81 neutrons?
137
What is the mass number for an atom of mercury containing 80 protons and 119 neutrons?
119
What is the mass number for an atom of zinc containing 30 protons and 39 neutrons?
69
An atom of the isotope ¹³³Cs contains how many protons (p), neutrons (n), and electrons (e)?
B) 55 p, 78 n, 55 e
What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons?
B) ¹¹⁴Sn