Who "modernized" the periodic table?

What is the molecular geometry of a molecule with four bonding domains and one nonbonding domain?

The water is found in an underground reservoir called an

Each period in the periodic table corresponds to what?

A car accelerates from 25 km/hr to 55 km/hr in 30 seconds. What is the car's acceleration

How much force is needed to move a brick with a mass of 345-kg a distance of 28m while doing 1008 j of work?

At a constant pressure and a temperature of 280 K, the gas in a cylinder has a volume of 10.0 liters. If the volume of the gas is increased to 20.0 liters, what is the new temperature? 2800 K 28 K 140 K 560 K

what must be the distance between source of sound and mountain to give an echo in 5 seconds?, (speed of sound at 0°c=33m/sec

What is the speed of a 50 g rock if its de Broglie wavelength is 3.32 x 10?

Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

How are energy and speed related