Consider the unspecified atom represented by this symbol: 7935 Br Complete this

Question

Consider the unspecified atom represented by this symbol: 7935 Br Complete this table with the correct information about the atom and its subatomic panicles: Imagine that the number of neutrons is increased by two. What would be the relationship of the resulting atom/species to the original one? Imagine that the number of electrons is increased by one. What would be the relationship of the resulting atom/species to the original one? 2. Write the electron configuration in spectroscopic notation (1 s^2 etc.) for each of the following. a. a sodium atom Answer b. an iron(III) ion Answer c. an oxide ion Answer 3. Describe Effective Nuclear Charge and its relationship to atomic radius.

Explanation / Answer

1) Name of the element is Bromine (Br)

Number of protons = 35

Number of neutrons = Mass number - Atomic number = 79-35 = 44 neutrons

Number of electrons = Number of protons = 35

It will be an isotope since the number of protons are same i.e. its two types of bromine with different weights 79 and 81

It will be isobars since the atomic mass are same

2)

Na = 1s2 2s2 2p6 3s1

Fe(+3) = 1s2 2s2 2p6 3s2 3p6 3d5

O(2-) ion = 1s2 2s2 2p6

3) The effective nuclear chage decrease the atomic radius, radius is inversely proportional to the maount of effective nuclear charge

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