Atomic no 2

The atomic number of helium is 2 and the atomic number of lithium is 3. Is it possible to have an element with atomic number 2.5?

The terminal carbon atom in 2- butene is …………………. hybridised.

The number of atoms in 2.4 moles of Fe are?

The number of atoms in 2.5mole of Na are?

The number of sodium atoms in 2 moles of sodium ferrocyanide is

Calculate the energy of Li^(+2) atom for 2^(nd) excited state.

Oxygen atoms and hydrogen atoms in H_2O_2 are collinear.

Hybridisation of central N atom in N_(2) O is

Write the valency of each atom in CO_2

Give two examples of gases with (1) atomicity = 2