1. An atom contains 28 protons, 31 neutrons, and 26 electrons. What is the atomi
ID: 475847 • Letter: 1
Question
1. An atom contains 28 protons, 31 neutrons, and 26 electrons. What is the atomic number of this atom? (Express your answer as an integer.)
2. An Mg-24 atom weighs 23.985 amu. How many grams does it weigh? How many micrograms? One amu is the same as 1.661 × 10-24 g. (Enter your answer to four significant figures.) m(Mg-24) = ? g m(Mg-24) = ? µg
3. If an atom weighs g, how many atomic mass units does it weigh? (Enter your answer to four significant figure 4. What would be the total mass of 28520 atoms of 24Mg? Give your answer in kilograms. (Enter your answer to four significant figures.)
Explanation / Answer
. An atom contains 28 protons, 31 neutrons, and 26 electrons. What is the atomic number of this atom? (Express your answer as an integer.)
Answer =28
59 Ni 282+
Explanation
59=28+31= mass number = protons+ neutrons
Number of Electrons = number of protons
The atomoic number of Ni is 28 (periodic table), therefore the number of protons is 28.
The atomic weight is 59 .
Hence = number of neutrons plus protons i
= 59-28=31 neutrons
Ion charge = #of protons - # of electrons
+2= 28 - # electrons
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