1. The atomic masses of two isotopes of silver are 105 and 111. The chemical sym
ID: 250673 • Letter: 1
Question
1. The atomic masses of two isotopes of silver are 105 and 111. The chemical symbol for silver is Ag.
(a) What are the number of protons and neutrons in each of the two isotopes?
protons in Ag-105:
neutrons in Ag-105:
protons in Ag-111:
neutrons in Ag-111:
(b) What is the number of orbiting electrons in each of the two isotopes when each is electrically neutral?
electrons in neutral Ag-105:
electrons in neutral Ag-111:
2. Consider a penny of mass 3.2 grams (1 gram is 0.001 kg)? You may assume that the penny is made purely out of copper. Get the number of neutrons plus protons in the nucleus of a copper atom from the periodic table on page 19 of your textbook (you may round off to a whole number of neutrons plus protons). You may assume that the proton mass and the neutron mass are equal (see the inside back cover of your textbook), and you may ignore the mass of an electron in comparison to the mass of a proton or neutron.
(a) How many atoms are in this penny? To enter your answer in scientific notation, type *.**E** (for example, the mass of the Earth, which is 5.97x10^24 kg, would be entered as 5.97E24). Enter only the number; don't try to enter the units.
number of atoms in the penny:
(b) How many electrons are in the same penny?
number of electrons in the penny:
Explanation / Answer
1. Isotopes have same number of protones but differnet neutrones. Ag Silver has 47 protones
(a)
protons in Ag-105: 47
neutrons in Ag-105:105-47 = 58
protons in Ag-111: 47
neutrons in Ag-111: 111-47 =64
(b)
electrons in neutral Ag-105 = numebr of protones: 47
electrons in neutral Ag-111 = numebr of protones: 47
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