The last orbit of argon would have electrons

Write the (n + l) value of one of the atomic electron present in the outermost orbit of ground electronic state of argon

What atomic number of an element "X" would have to become so that the 4th orbit around one electron species of X ion would fit inside the first Bohr orbit H-atom?

The radius of the second orbit of an electron in hydrogen atom is 2.116A . The de Broglie wavelength associated with this electron in this orbit would be

The radius of the second orbit of an electron in hydrogen atom is 2.116A . The de Broglie wavelength associated with this electron in this orbit would be

a) An orbital can hold only two electrons b) An orbital must have electrons with opposite spins. Which is correct ?

Element A has 3 electron in the outermost orbit and element B has 7 electrons in the outermost orbit. The formula of the compound formed between A and B would be