Who came up with the sphere model and said an atom was made up of solid particles and cannot be broken down?

who came up with the "plum pudding" model, found out the atom was made up of protons an d electrons, discovered the electron

he found that protons are found in the center of the nucleus, electrons are scattered outside the nucleus, discovered the nucleus

made "planetary" model, protons and neutrons are found in the center of the nucleus, and electrons are placed in orbits that circle around the nucleus

shows that electrons are found in a cloud around the nucleus and the location around the nucleus is determined by probalitity

atoms are made up of...

protons and neutrons are located in...

what is the charge of a proton?

what is the charge of a neutron?

what is the charge of an electron?

what is the mass of a proton?

what does amu stand for?

what is the mass of a neutron?

what is the mass of an electron?

neutral atoms have an equal amount of ___________ and ______________

number of neutrons + number of protons =

what is the atomic number on the periodic table?

what is the mass number on the periodic table?

what do you change to decimals when calculating average atomic mass?

what does the number represent in this notation?     neon-20

what are atoms that are the SAME element

isotopes have the same number of...

isotopes DO NOT have the same number of...