Two part question. Please answer BOTH parts clearly and correctly.Only one corre

Question

Two part question. Please answer BOTH parts clearly and correctly.Only one correct answer per part.

Iron has atomic number = 26. Naturally mined iron contains isotopes of mass numbers: 54, 56, 57, and 58. Which of the following statements is FALSE? A) every atom of iron has 26 protons B) some iron atoms have 30 neutrons C) some iron atoms have 54 neutrons D) there are four kinds of naturally occurring iron atoms with the same chemical properties Let Z denote the atomic number and A denote the mass number of a nucleus. The number of neutrons in this nucleus is: A) Z B) A-Z C) A-2Z D) A E) 2A-Z

Explanation / Answer

Here,

Q1)

as Z = 26

number of neutrons = 28 , 30 , 31 , 32

hence the option that is false is

C) some iron atoms have 54 neutrons

Q2)

as number of neutrons , N = atomic mass - atomic number

N = A - Z

the correct option is B) A - Z

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