What is the charge of an ion that contains 21 protons and 19 electrons?

2 3 4 5 6 What did Virchow observe that led him to determine one of the main components of cell theory?

What effect does acid have on buildings?

Investigating iron thiocyanate requires several chemicals which must be used with caution. Using knowledge of these chemicals, select whether the following statements are true or false.

More than three fourths of the air we breath

What is the electron configuration for a neutral atom of selenium? For a neutral atom of beryllium?

The energy of a particular color of green light is 3.81*10-22 kJ/photon. The wavelength of this light is nanometers

How many molecules are in. 25 mole of O2

A flexible container is filled with 960.0 liters of air at 38 degrees Celsius. If pressure in the container does not change, at what temperature will the container have at a volume of 350.0 liters?

Which subatomic particles are paired with their charges? 1. electron-positive, neutron-negative, proton-neutral 2. electron-negative, neutron-neutral, proton-positive 3. electron-negative, neutron-positive, proton-neutral 4.

Where do you think information is coded in a DNA molecule?