Elements of Life

Which scientist cut up a piece of material until he discovered what then was thought to be the smallest particle an atom?

Who discovered the later to be named electron?

What particle did Rutherford shoot at a piece of thin gold foil during his experiment to confirm that an atom is mostly empty space?

What did Rutherford discover about the atom due to his experiment with firing particles at gold foil?

What of the below evidence supported Bohrs hypothesis that electrons are located at specific energy levels.

[blank_start]Dalton's[blank_end] Billiard Balls- Conclusion- Atoms are [blank_start]solid spheres[blank_end]. Atoms are of the same element [blank_start]are identical[blank_end]. Evidence- When observing the formation of [blank_start]compounds[blank_end] and the atom rearrangement.

When an electron [blank_start]absorbs energy[blank_end] it is [blank_start]excited[blank_end] to a higher energy level. However the electron is [blank_start]unstable[blank_end] in its [blank_start]excited position[blank_end] so in turn [blank_start]drops to[blank_end] any lower energy level. The electron [blank_start]emits energy[blank_end] in the process in the form of [blank_start]light[blank_end].

Which of the following terms is the definition of relative isotopic mass?

Which of the followings are correct for the term isotope.

Which of the following is the definition for relative atomic mass?

What machine in the chemical industry is used to identify elements in a sample?

The peaks on a graph showing the elements found in a sample represent what?

What shape is an 's' orbital?

What shape is a 'p' orbital?