Question

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

1. atomic number
2. atomic mass
3. number of orbits
4. number of neutrons
5. number of electrons in n=3
6. number of valence electrons

A. 197
B. 79
C. 1
D. 18
E. 118
F. 6

Answer 1

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
meow meow

Answer 2

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.