Question

Using the periodic table entry below, match the phrases with their corresponding values.

Answer 1

Answer:

For 1: Atomic number :  79

For 2. Atomic mass : 197

For 3. Number of orbits  : 6

For 4. Number of neutrons : 118

For 5. Number of electrons in n=3 : 18

For 6. Number of valence electrons : 1

Explanation:

• Atomic number is defined as the number of protons or electrons present in an atom. Here 79 corresponds to the Atomic Number.

• Atomic mass is defined as the Sum of neutrons and protons present in an atom. Here, 197 corresponds to the Atomic Mass.

• Atomic Mass = Number of protons + Number of neutrons

Here, Number of protons = 79

So, $197=\text{Number of Neutrons}+79\\\\\text{Number of neutrons}=118$

• Valence electronic configuration of  the atom having atomic number as 79 is : $[Xe]5d^{10}6s^1$

Number of orbit corresponds the higher value of 'n' which is the principle quantum number. Here, n = 6 so, number of orbits are also 6.

• In orbit having n = 3, there are 3 sub-shells: s, p and d. The number of electrons that can be occupied in s-subshell = 2

The number of electrons that can be occupied in p-subshell = 6

The number of electrons that can be occupied in d-subshell = 10

Total number of electrons that can be occupied in  orbit having n = 3 are (2 + 6 + 10) = 18 electrons.

• From the electronic configuration, it is visible that valence electrons in atom having atomic number 79 is 1.

Answer 2

atomic number 79
atomic mass 197
number of orbits 6
number of neutrons 118
number of electrons in n=3 18
number of valence electrons 1
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