532443
| Question | Answer |
| John Dalton | "atoms cannot be broken down and all atoms of an element are identical" |
| William Crookes | "Identified a stream of negatively charged particles" |
| J.J Thomson | "the atom can be broken into smaller particles and electrons are mixed with the positive particles." |
| Ernest Rutherford | "mostly empty space and small, positive nucleus." |
| Proton | "positive, mass- 1 amu, located in the nucleus" |
| Neutron | "neutral, mass- 1 amu, Location- nucleus" |
| Electron | "Negative, mass- 0 amu, location- electron cloud" |
| Fact on Isotope | Isotopes of an element have the same number of electrons and protons, but different neutrons. |
| An a- particles has? | protons-2, neutrons-2, and electrons-0 |
| A B- particle has? | Proton-1, neutron-1, electron-1 |
| Dmitri Mendeleev | "a Russian chemist who built the periodic table of elements." |
| Henry Moseley | " an English physicist who arranged the elements according to the atomic number. |
| How many periods are there on the periodic table of elements? | 7 |
| How many groups are there on the periodic table? | 18 |
| Metal properties (hint 6) | Good conductors, malleable, luster, solids (mercury liquid),ductile, left |
| Non-metal properties (hint 5) | Bad conductors, brittle, dull, gases (bromine liquid), right |
| Iron Triad | Fe, Co, Ni. Metals |
| Coinage metals | Cu, Ag, Au. Pure in nature. |
| Lanthanides | soft |
| Actinides | radioactive |
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