...two groups (1 and 2) belong to...their oxides and hydroxide...ber of shells and contracti... Melting and boiling p...Alkali metals and their sal...metal cations and ammoniate...absorption of photons occur...;Atomic radii and ionic rad...and opaque to X-rays is used u...

...ric field and magnetic fiel...physical and chemical chan...y produce X-rays. (viii)...orescence and phosphore...magnetic and electric...Photon Photons are t...adiation. Photons are e...frequency and threshold...e. X-rays Whe...ic number and high melting...of X-ray photons depends...f emitted X-rays is given...