Chemistry - Mistake deck Flashcards
(31 cards)
what where atoms believed to be before electrons where discovered
tiny solid spheres
what did the discovery of the electron lead to
plum pudding model
what sub atomic particle was discovered first
electron
what sub atomic particle was discovered after the electron
protons
what sub atomic particle was discovered after the proton
the neutron
what is the plum pudding model
atoms that are balls of positive charge
with negative charge of electrons embedded within
what is the differences between the nuclear model and plum pudding model
mostly empty space in the nuclear model
balls of positive charge the in the plum pudding model
mass in concentrated in the nucleus
how did neils Bhor adapt the nuclear model
electrons orbited the nucleus
electrons are at specific distances from the nucleus
what are isotopes
atoms of the same element that have the same number of protons but different numbers of neutrons
why do atoms of the same element have the same atomic number
because they have the same number of protons
what did the alpha particle scattering experiment show
most of the atom is empty space
the atoms mass is concentrated at the nucleus
leading to the nuclear model replacing the plum pudding model
who proved the existence of neutrons
james chadwick
what did john dalton do
described atoms as solid spheres
the different spheres made different elements
what did JJ thomson do
showed atoms arent solid spheres
proved that there must be something smaller in the atom electrons
who created the plum pudding model
JJ thomson
what did james chadwick do
prove the existence of neutrons
what did rutherford do
conducted the aplha particle scattering experiment
created the origonal nuclear model of the atom
what did neils Bohr do
proposed electrons orbit the nucleus in fixed shells
each shell is a fixed distance from the nucleus
going down group 7 reactivity
increases
why does group 7 reacitivity increase
size of molecules increase so intermolecular forces increase
Explain why sodium oxide has a high melting point.
giant structure
stronger electrostatic attraction between oppositely charged ions
large amount of energy is needed to break the bonds
three differences between metals and non metals
metals are shiny
metals are malleable
metals conduct electricity
name three properties that transition metals share with other metals
good thermal conductors
dense
strong
shiny
how does reactivity change as you go down the group 7
they decrease
