Solution-Identify the following as elements or compounds a

Q1. What is the mass number of an iron atom that has 28 neutrons?

Q2. Calculate the number of neutrons of 239Pu.

Q3. Write the appropriate symbol for each of the following isotopes: (a) Z= 11, A= 23; (b) Z= 28, A= 64

Q4. Define, with two examples, the following terms: (a) alkali metals, (b) alkaline earth metal, (c) halogens, and (d) noble gases.

Q5. Identify the following as elements or compounds: (a) NH₃, (b) N₂, (c) CO, (d) Co, and (e) He.

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Identify the following as elements or compounds a nh3 b n2 : q1. what is the mass number of an iron atom that has 28 neutrons?q2. calculate the number of neutrons of 239pu.q3.

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