An atom has a mass number of 27 and 14 neutrons. what is the atomic number of this atom?

The periodic table was arranged so that properties could be predicted for elements, just by looking at their position in relation to other elements. Consider two of the group 2 elements, Magnesium and Strontium.

What happens when an electron absorbs energy? A. The electron moves from a lower energy orbital to a higher energy orbital. B. The electron falls into the nucleus. O C. The electron moves from a higher energy orbital to a lower energy orbital. O D.

A car is traveling 150 km in 7200 s what is the speed of the car

Which instrument is most often used to measure acid volume before a titration begins? A. a burette B. a beaker C. a volumetric pipette D. an Erlenmeyer flask

The particles remain separate and don't combine. Does this describe a mixture or a solution

4. What electrons are involved in chemical bonding?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

What is the formula for lithium iodide

Which statement would be the most useful for deriving the ideal gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume.

What monomers are used to construct this polymer and where are they found?