Atomic structure and radioactivity

The word "atom" means what?

• "indivisible"
• "Adam"
• "extremely small"
• "indestructible"

Almost all of the mass of an atom is found in what part?

• The electron cloud
• The nucleus
• The protons
• The charge

Tags

NGSS.HS-PS1-8

Under the guidence of Rutherford, what particle did Geiger & Marsden fire at gold foil?

• Neutron

• Alpha

• Proton

• Electron

Proposed that the atom had a dense positively charge center which was extremely small but consisted of mostly empty space.

• Ernest Rutherford
• J.J Thomson
• Robert Millikan
• John Dalton

During the thin foil experiment, it was seen that a______of alpha particles passed through the thin foil because the atom__________.

• majority; was dense
• few; was mostly empty space
• majority; was mostly empty space
• few; was dense

Tags

NGSS.HS-PS1-3

All atoms consist of mostly empty space.

• True
• False

What is the charge of electron?

• 1.6x10^-19 C

• -1.6x10^-19C

• 1.6x10¹⁹C

• -1.6x10^19C

What is radioactivity?

• It this the process when nuclei absorb radio wave

• It this the process when unstable nuclei emit radiation

• It is the process when unstable nuclei absorb radar

• It this the process when unstable nuclei emit radar

Tags

NGSS.HS-PS1-8

With which nuclei does alpha particle is like?

• Hydrogen nuclei

• Helium nuclei

• Carbon Nuclei

• Aluminium nuclei

In Rutherford experiment, a very few alpha particle is bounce back. What does this statement means!

• The atom consisted of positively charge particle called proton which cover all of the atom while very small part of it is electron

• The atom hits a very dense part of atom which very small later called nucleus

• An atom consisted of negatively charge particle called electron which surround the nucleus

• Atom consisted mostly dense part