number series?? #shorts

Write the next number series :

The wave number of the series limit of Lyman series is -

If the series limit of Lyman series for Hydrogen atom is equal to the series limit Balmer series for a hydorgen like atom, then atomic number of this hydrogen-like atom will be

Continuous Series- Short Cut Method|Continuous Series- Step Deviation Method

Continuous Series- Short Cut Method|Continuous Series- Step Deviation Method

If the shorts series limit of the balmer series for hydrogen is 3644 Å , find the atomic number of the element which gives X-ray wavelength down to 1 Å . Identify the element.

Number of short periods in Mendeleef table

P_(4)O_(10) has short and long P-O bonds. The number of short P-O bonds in this compounds is