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Nickel has 28 protons. If it has 31 neutrons, what is its atomic mass?
Pb
Na
elements
127
20
59
elements
Ag
What are the substances that cannot be broken down into simpler substances?
Pb
Na
elements
127
20
59
elements
Ag
Which of the following chemical symbols represents the element sodium?
Pb
Na
elements
127
20
59
elements
Ag
What is the chemical symbol for lead?
Pb
Na
elements
127
20
59
elements
Ag
The atomic mass of potassium is 39. If its atomic number is 19, it has how many neutrons within each potassium atom?
Pb
Na
elements
127
20
59
elements
Ag
Which of the following chemical symbols represents the element silver?
Pb
Na
elements
127
20
59
elements
Ag
Iodine has 53 protons and 74 neutrons. What is its atomic mass?
Pb
Na
elements
127
20
59
elements
Ag
All substances are composed of ________________.
Pb
Na
elements
127
20
59
elements
Ag
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