Determine what elements are denoted by the following electrons: [Kr] 5s2 4d10 5p3

Can someone me with 1 to 4 plz. fast

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

What type of matter is made of only one kind of atom