Flashcards
Atoms
Cards in this deck (27)
- 1what's needed to see atoms?scanning tunnelling microscope or STM.
- 2how many known atoms are there?118
- 3how many are found naturally on earth?88
- 4where do you find the other 20?they were made in a lab
- 5one type of atom substance?element.
- 6carbon.only non- metallic element that can form crystal lattices.
- 7compounds.substance made up of more than one type of atom.
table salt eg - 8what are subatomic particles?smaller particles inside the atoms.
- 9what are they?neutrons, protons and electrons.
- 10where do you find protons and neutrons?in the nucleus.
- 11where do you find electrons?area outside of nucleus - electron cloud.
- 12charge of protonspositive.
- 13charge of electronsnegative
- 14charge of neutronsneutral
- 15attractionopposite electric charges attract each other.
- 16how to find subatomic particlesprotons = atomic number
electrons = NO. of protons
neutrons = mass NO. minus NO. of protons. - 17why don't atoms have a charge?positive NO. of protons is the same as negative NO. of electrons
- 18what did Ernest Rutherford do?he discovered that the nucleus only takes up a small part of an atom.
- 19how did he do this?he fired a beam of alpha particles (helium nuclei) at a thin sheet of gold.
- 20how did he come to the conclusion?most of the particles went straight through but some bounced back,
- 21what made the alpha particles bounce backnuclei
- 22whats the charge of a nucleus?postive
- 23what are ions?atoms that lose or gain electrons.
- 24cation.an atom that loses an electron, earns a positive charge as there are more protons that electrons now.
- 25anionan atom that gains an electron, earns a negative charge as there are less protons that electrons now.
- 26how are ions formed?when some substances dissolve in water.
- 27—
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- Flashcards on Atoms, created by Elma Bejhanovic on 24/05/2017.
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- Elma Bejhanovic
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