Question

A noble gas in the same period as Zr

Answer 1

Xenon, Xe

Step-by-step explanation:

Atomic number of Zr = 40

Electronic configuration of Zr =
`[Kr] 4d^2 5s^2`

As last electron enters in 5th shell, therefore, Zr belongs to period 5.

The noble gas which present in 5th period is Xe.

Atomic number of Xenon = 54

Electronic configuration of Xe =
`[Kr] 4d^2 5s^25p^6`

So, Xe also belongs to period 5

Answer 2

Xenon

Step-by-step explanation:

Zr or Zirconium is in period 5 just as Xenon is. Periods are the same as rows so essentially they are both in row 5. All noble gases are found in group (column) 8