atomic structure Flashcards
why are all atoms electrically neutral?
the number of protons and electrons present in each atoms is the same
what is the mass number/nucleon number?
protons + neutrons
what are isotopes?
atoms of the same element with the same number of protons but different number of neutrons
what are proton number/atomic number?
the number of protons in an atom
what is a relative atomic mass?
ratio of the average mass of an atom 1/12 the mass of a carbon atom
what kind of properties do isotopes have?
isotopes have the similar chemical properties but have slightly different physical properties
how many electrons can be in the first electron shell?
2
how many electrons can be in the second/third electron shell for the first 20 elements?
8
what does the electronic structure/electronic configuration show?
arrangement of electrons in atom and affects the chemical properties of the atom
what is the valence electron shell?
shell that is further away from the nucleus
what does the number of valence electrons determine?
the chemical properties of the atom
