An atom with 39 protons and a mass number of 89 what is the number of neutrons

Whose proposal of quanta lead to the development of quantum theory?

How long does it take for a purple stem plant to grow

The empirical formula for ethane is CH3. The molar mass of propane is 30.08 grams per mole. Determine the molecular formula of ethane.

Explain whether nitrogen atoms will form bonds with other atoms.

What is science in short

Describe one major laboratory accident mentioned in the training presentation, what chemicals were involved, the type of PPE that was worn at the time of the accident, and how it could have been prevented.

Which process creates food for plants in order to maintain homeostasis? Breathing Cell division Cellular respiration Photosynthesis

Describe a proton, neutron, and electron. Where are these particles located inside an atom.

A sample of gas is at 273°K and 2.00 atm with a volume of 6.00 liters. When the gas is compressed to 3.00 liters and the pressure increases to 3.00 atm, what is the new temperature of the sample?

Which oxygen pachages materials and distributed them throughout the cell