Mass of total positive charge present in an atom is 7348 times to that of the mass of a negativity charged particle . Find the atomic number of an element . Find out its valency.

Explanation

Mass of a proton is 1837 times that of electron
Mass of one proton = 1837
How many protons mass is equal to 7348
`(7348)/(1837) = 4`
Hence, the atomic number is 4. Electronic arrangement is 2, 2. It can lose 2 electrons to attain dupler configuration, and hence, it forms `Be^(+2)` ion.
Hence, its valency is +2