<u>Answer:</u>
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
<u>Explanation:</u>
- 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,
- Valence electronic configuration of the atom having atomic number as 79 is :
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.