A sample of platinum contains 4.02 x 1024 atoms. How many moles is this?

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 is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro