What elements are involved in hydrogen bonding

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

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