Must answer every question.. 1) Iron has atomic number 26. Naturally mined iron

Question

Must answer every question..

1) 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. The isotopes may be separated in a mass spectrometer

E. There are four kinds of naturally occurring iron atoms with the same chemical properties

2)Consider the following energies:

- minimum energy needed to excite a hydrogen atom

-energy needed to ionize a hydrogen atom

-energy released in 235Ufission

-energy needed to remove a neutron from a 12 C nucleus Rank them in order of increasing value. "

A. 1, 2, 3, 4

B. 1, 3, 2, 4

C. 1, 2, 4, 3

D. 2, 1, 4, 3

E. 2, 4, 1, 3

Explanation / Answer

For question 1 the answer is C.Some iron atoms have 54 neutrons

The neutron number is the mass number - Atomic number=56-20=30 neutrons are in the nucli. So the option for 54 neutron is a false statement.

b)1,2,4,3 is the correct answer.

Highest Energy is released in nuclear fission process of uranium,it is about 200 Mev. Then highrst energy is needed to remove a neutron from a 12 C nucleus And the least energy is required to excite a hydrogen atom

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