Which diagram shows the variation of the metallic radius r of the Group I elements, Li, Na, K and Rb, with increasing proton (atomic) number?
John Dalton’s atomic theory, published in 1808, contained four predictions about atoms.
Which of his predictions is still considered to be correct?
- All atoms are very small in size.
- All the atoms of a particular element have the same mass.
- All the atoms of one element are different in mass from all the atoms of other elements.
- No atom can be split into simpler parts.