chemistry(1st round)
cathode
阴极
proton
质子
gold foil experiment
金箔实验
compose
组成
isotope
同位素
electrons
电子
neutron
中子
pudding model
布丁模型
atomic number=
the number of protons
mass number=
the sum of protons and neutrons
concentric circular
同心圆
neucleus
原子核
the fest of the atom is________
empty space
mass number
原子质量
_______are atoms that have the same number of protons, but have different number of neutrons
isotopes
all elements composed of tiny particales
atom
periodic table
元素周期表
electrons arranged in concentric circular pattern around_________
neucleus
atomic number
原子序数
what's the atomic number of carbon?
12 (protons)
atoms of the same elements are_______
identical
arrange
排列
________reaction cannot change atoms of one type of elements to another
chemical
atoms of different elements can physically mix together or chemically combine to form________
compound
what's the mass number of carbon ?
6