How are the relationships of elements in a group different from the relationships of elements in a period?

Scientists discover two planets orbiting a distant star. The average distance from the star to Planet A is 8 AU, and it takes 710 Earth days for Planet A to orbit the star.

How can the mentos and soda experiment effect the real world?

Why do people cover their flowers on a cool night. Think about radiation absorption conduction and temperature

Lauren's friend asked her to come hang out this weekend with some people from the school tennis team. what question should lauren ask to protect her heath and safety? a) what will we be doing? b) what will you be wearing?

Determine the ratio of Earth's gravitational force exerted on an 80-kg person when at Earth's surface and when 1400 km above Earth's surface. The radius of Earth is 6370 km.

A taxi hurries for 1 3/4 hours with a constant speed of 84 mph and then for another 1 hour 45 minutes with a constant speed of 24 mph. what is its average speed for the total trip?

A carbon atom has how many valence electrons?

X-rays UV light waves Sound waves Earthquake waves. All of these have which characteristic in common?

V=345m/s, 7210Hz, X=?

As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. Determine the energy of the absorbed photon in electronvolts.