Indicate whether each of the following statements about atomic structure is true

Question

Indicate whether each of the following statements about atomic structure is true or false. A neutral oxygen atom has X electrons located in 2 different electron orbitals. Hydrogen has only one neutron and no protons in its nucleus. Almost all of the mass of an atom is concentrated in its electrons. The reactivity or chemical behavior of an atom depends primarily on the number of neutrons it has. Comparing the pairs of elements listed below, choose the pair in which both atoms have nuclei with the same number of neutrons. Given the electronegativity of each of the following atoms, rank the bonds from most polar (number 1) to least polar (number 5). O = 3.5. N = 3.0, C = 2.5, H = 2.1.

Explanation / Answer

Number of neutron= Mass Number(A)- Atomic Number(Z)

1. 37Li , neutron= 7-3=4 , 49Be, neutron=9-4=5

2. 11 23Na, neutron= 23-11= 12, Mg , neutron= 24-14=12

3. S, neutron= 32-16=16 Mn= 54-25=19

4. N, neutron=14-7=7, O= 16-8=8

So, Mg and Na have same number of neutrons

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