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Zirconium has an atomic number of 40 and an atomic mass of 91. How many neutrons does it have?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
The atomic mass of potassium is 39. If its atomic number is 19, it has how many neutrons within each potassium atom?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
Nickel has 28 protons. If it has 31 neutrons, what is its atomic mass?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
The atomic mass of an element is found by which of the following methods?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
What is the chemical symbol for lead?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
Which of the following chemical symbols represents the element silver?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
All substances are composed of ________________.
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
Iodine has 53 protons and 74 neutrons. What is its atomic mass?
59
20
51
adding the number of protons and neutrons
Ag
127
elements
Pb
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