structure of an atom. Flashcards
what is the radium of an atom?
around 1 times10^-10 meters.
what do atoms contain?
positively charge nucleus and surrounded by negative electrons and positive protons
what sub-atomic particles are in the nucleus?
positive protons.
neutral neutrons.
what do atoms have an equal number of?
electrons and protons.
due to atoms having an equal number of electrons and protons what does this suggest about the charge?
no overall charge.
what does the nucleus contain?
most of the atoms mass.
when might the energy level of an electron change?
atom emits or absorbs electromagnetic radiation.
what will absorbing electromagnetic radiation do to an electron?
moves electrons to a higher energy level, further from the nucleus.
when is electromagnetic radiation emitted?
when an electron drops to a lower energy level.
when an atom looses one of its outer electrons what does it become?
positive ion.
if an electron gains an extra electron what does it become?
negative ion.
what is different about the shells?
correspond to different energy levels.
why might electron arrangements change and how does this affect the electrons?
absorption of electromagnetic radiation.
↳electron moves away from nucleus; a higher energy level.
emission of electromagnetic radiation.
↳ electron moves closer to the nucleus; a lower energy level.
what is the relative mass and charge of: proton.
1.
+1.
what is the relative mass and charge of: neutron.
1.
0.
