C1 Flashcards
What was John Daltons original thesis of the atom
That all substances have their own elements and were like tiny hard spheres but that they could not be split up any further.
Who theorised the plum pudding model of the atom
J.J. Thompsom in the late 1800s. It was the discovery of the electron.
How was the nucleus discovered?
Gold foil experiment
How did the gold foil experiment prove the existence of the nucleus.
The alpha particles would bounce off or be drawn too the positive nucleus and fly off in different directions
who theorised the nucleus
Rutherford
Who theorised electron shells
Nichols bohr
Who discovered electrons?
James Chadwick
Who produced the current idea of the periodic table
Mendeleev in 1869
What direction does the reactivity go in the halogens?
Decreases as the group descends
Why is Flourine more reactive than chlorine?
Its outer shell is closer to the nucleus and so an incoming electron will feel more of an attraction to Flourine
What is a limitation of the particle model?
The model assumes the substances are solid spheres but atoms are actually mainly empty space
