Atomic
mass
period
group/
family
element
name
fill in the chemical symbol.
hydrogen ch )
(metal
(wait until
(rounded)
1
helium he
4
18
no
caloumi
argon (ac)
potassium lk
chlorine tl
oxygen 20
magnesium 19.
scandium 60
nitrogen
carbon

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

List four observations that indicate that a chemical reaction may be taking place

Which material burns faster? metal aluminum