number of protons and neutrons in the atom. Rearrange the equation to find number of protons or number of neutrons and the mass number. Explain how isotopes of elements, all have the same number of protons but have a different number of neutrons. Define isotope. Describe an atom in terms of number of protons, neutrons and electrons when given the following representation . 6.4.1.3 Scientific models New experimental evidence 0.6 Why has the model of the atom Model the alpha Video clip of the atom and may lead to a scientific changed since ancient Greek scattering experiment YouTube: how these models model being changed or times? by flicking a 1p coin have changed. replaced. through stack of 2p Describe and explain why coins. The 1p coin Before the discovery of the scientific models are replaced. Video clip represents the alpha electron, atoms were thought particle and the stack Describe why ancient Greeks YouTube: to be tiny spheres that could of 2p coins the gold thought that the atom not be not be divided. foil. How must the divided. stacks be arranged in The discovery of the electron Past Exam Questions – Draw a diagram to illustrate the order that 90% of the led to the Exampro ref: ‘plum-pudding model’ of the atom. ‘plum-pudding model’ of the atom. The coins go straight 1. QCJ98H3.13 through without model’ 2. Q13W.Y2H.08 ‘plum-pudding
number of protons and neutrons in the atom. Rearrange the equation to find number of protons or number of neutrons and the mass number. Explain how isotopes of elements, all have the same number of protons but have a different number of neutrons. Define isotope. Describe an atom in terms of number of protons, neutrons and electrons when given the following representation . 6.4.1.3 Scientific models of the atom and how these models have changed. New experimental evidence may lead to a scientific model being changed or replaced. Before the discovery of the electron, atoms were thought to be tiny spheres that could not be divided. The discovery of the electron led to the ‘plum-pudding model’ of the atom. The ‘plum-pudding model’ 0.6 Why has the model of the atom changed since ancient Greek times? Describe and explain why scientific models are replaced. Describe why ancient Greeks thought that the atom not be divided. Draw a diagram to illustrate the ‘plum-pudding model’ of the atom. Model the alpha scattering experiment by flicking a 1p coin through stack of 2p coins. The 1p coin represents the alpha particle and the stack of 2p coins the gold foil. How must the stacks be arranged in order that 90% of the coins go straight through without Video clip YouTube: Video clip YouTube: Past Exam Questions – Exampro ref: 1. QCJ98H3.13 2. Q13W.Y2H.08
AQA-8464F-ATOMIC.DOCX