Atomic no 5

A hydrogen atom is in 5^("th") excited state. When the electron jumps to ground state the velocity of recoiling hydrogen atom is "…................" m//s

The atomic number of three elements A, B and C are given below : {:("Element",A,B,C),("Atomic number",5,7,10):} Answer the following: (a) Write the group number of the three elements in the Modern Periodic Table. (b) Mention the period of these elements in the Modern Periodic Table. (c) Out of these three elements which one has the smallest atomic radius and why ?

The number of atoms in 5.4 moles of Fe are?

The number of atoms in 5.4mole of Na are?

The number of atom in 5.25g of NH_3 is approx:

The number of atom in 5.69g of NH_3 is approx:

Find moles of O-atoms in 5.6 litres of SO_(3) at 0^(@)C ,1 atm ?

An element with atomic number 5 belongs to III A group of the modern periodic table . Find Oxide of element .

An element with atomic number 5 belongs to III A group of the modern periodic table. Find Valency

An element with atomic number 5 belongs to III A group of the modern periodic table. Find the number of valence electrons